diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/iscsi_tcp.c | 2837 | ||||
| -rw-r--r-- | drivers/scsi/iscsi_tcp.h | 182 |
2 files changed, 813 insertions, 2206 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index aca3e23b1b9..fe00a3f6d20 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -3,7 +3,8 @@ * * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman - * Copyright (C) 2005 Mike Christie + * Copyright (C) 2005 - 2006 Mike Christie + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * maintained by open-iscsi@googlegroups.com * * This program is free software; you can redistribute it and/or modify @@ -36,10 +37,6 @@ #include <linux/mutex.h> #include <net/tcp.h> #include <scsi/scsi_cmnd.h> -#include <scsi/scsi_device.h> -#include <scsi/scsi_eh.h> -#include <scsi/scsi_request.h> -#include <scsi/scsi_tcq.h> #include <scsi/scsi_host.h> #include <scsi/scsi.h> #include <scsi/scsi_transport_iscsi.h> @@ -52,21 +49,14 @@ MODULE_DESCRIPTION("iSCSI/TCP data-path"); MODULE_LICENSE("GPL"); MODULE_VERSION("0:4.445"); /* #define DEBUG_TCP */ -/* #define DEBUG_SCSI */ #define DEBUG_ASSERT #ifdef DEBUG_TCP -#define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt) +#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt) #else #define debug_tcp(fmt...) #endif -#ifdef DEBUG_SCSI -#define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt) -#else -#define debug_scsi(fmt...) -#endif - #ifndef DEBUG_ASSERT #ifdef BUG_ON #undef BUG_ON @@ -74,17 +64,12 @@ MODULE_VERSION("0:4.445"); #define BUG_ON(expr) #endif -#define INVALID_SN_DELTA 0xffff - static unsigned int iscsi_max_lun = 512; module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); /* global data */ static kmem_cache_t *taskcache; -#define session_to_cls(_sess) \ - hostdata_session(_sess->host->hostdata) - static inline void iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size) { @@ -133,68 +118,39 @@ static inline void iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf, u8* crc) { - crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc); - buf->sg.length += sizeof(uint32_t); -} + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; -static void -iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) -{ - struct iscsi_session *session = conn->session; - unsigned long flags; - - spin_lock_irqsave(&session->lock, flags); - if (session->conn_cnt == 1 || session->leadconn == conn) - session->state = ISCSI_STATE_FAILED; - spin_unlock_irqrestore(&session->lock, flags); - set_bit(SUSPEND_BIT, &conn->suspend_tx); - set_bit(SUSPEND_BIT, &conn->suspend_rx); - iscsi_conn_error(conn->cls_conn, err); + crypto_digest_digest(tcp_conn->tx_tfm, &buf->sg, 1, crc); + buf->sg.length += sizeof(uint32_t); } static inline int -iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) +iscsi_hdr_extract(struct iscsi_tcp_conn *tcp_conn) { - uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); - uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); - - if (max_cmdsn < exp_cmdsn -1 && - max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) - return ISCSI_ERR_MAX_CMDSN; - if (max_cmdsn > session->max_cmdsn || - max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) - session->max_cmdsn = max_cmdsn; - if (exp_cmdsn > session->exp_cmdsn || - exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) - session->exp_cmdsn = exp_cmdsn; + struct sk_buff *skb = tcp_conn->in.skb; - return 0; -} - -static inline int -iscsi_hdr_extract(struct iscsi_conn *conn) -{ - struct sk_buff *skb = conn->in.skb; + tcp_conn->in.zero_copy_hdr = 0; - if (conn->in.copy >= conn->hdr_size && - conn->in_progress == IN_PROGRESS_WAIT_HEADER) { + if (tcp_conn->in.copy >= tcp_conn->hdr_size && + tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) { /* * Zero-copy PDU Header: using connection context * to store header pointer. */ if (skb_shinfo(skb)->frag_list == NULL && - !skb_shinfo(skb)->nr_frags) - conn->in.hdr = (struct iscsi_hdr *) - ((char*)skb->data + conn->in.offset); - else { + !skb_shinfo(skb)->nr_frags) { + tcp_conn->in.hdr = (struct iscsi_hdr *) + ((char*)skb->data + tcp_conn->in.offset); + tcp_conn->in.zero_copy_hdr = 1; + } else { /* ignoring return code since we checked * in.copy before */ - skb_copy_bits(skb, conn->in.offset, - &conn->hdr, conn->hdr_size); - conn->in.hdr = &conn->hdr; + skb_copy_bits(skb, tcp_conn->in.offset, + &tcp_conn->hdr, tcp_conn->hdr_size); + tcp_conn->in.hdr = &tcp_conn->hdr; } - conn->in.offset += conn->hdr_size; - conn->in.copy -= conn->hdr_size; + tcp_conn->in.offset += tcp_conn->hdr_size; + tcp_conn->in.copy -= tcp_conn->hdr_size; } else { int hdr_remains; int copylen; @@ -204,30 +160,31 @@ iscsi_hdr_extract(struct iscsi_conn *conn) * copying it... This'll happen quite rarely. */ - if (conn->in_progress == IN_PROGRESS_WAIT_HEADER) - conn->in.hdr_offset = 0; + if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) + tcp_conn->in.hdr_offset = 0; - hdr_remains = conn->hdr_size - conn->in.hdr_offset; + hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset; BUG_ON(hdr_remains <= 0); - copylen = min(conn->in.copy, hdr_remains); - skb_copy_bits(skb, conn->in.offset, - (char*)&conn->hdr + conn->in.hdr_offset, copylen); + copylen = min(tcp_conn->in.copy, hdr_remains); + skb_copy_bits(skb, tcp_conn->in.offset, + (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset, + copylen); debug_tcp("PDU gather offset %d bytes %d in.offset %d " - "in.copy %d\n", conn->in.hdr_offset, copylen, - conn->in.offset, conn->in.copy); + "in.copy %d\n", tcp_conn->in.hdr_offset, copylen, + tcp_conn->in.offset, tcp_conn->in.copy); - conn->in.offset += copylen; - conn->in.copy -= copylen; + tcp_conn->in.offset += copylen; + tcp_conn->in.copy -= copylen; if (copylen < hdr_remains) { - conn->in_progress = IN_PROGRESS_HEADER_GATHER; - conn->in.hdr_offset += copylen; + tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER; + tcp_conn->in.hdr_offset += copylen; return -EAGAIN; } - conn->in.hdr = &conn->hdr; - conn->discontiguous_hdr_cnt++; - conn->in_progress = IN_PROGRESS_WAIT_HEADER; + tcp_conn->in.hdr = &tcp_conn->hdr; + tcp_conn->discontiguous_hdr_cnt++; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; } return 0; @@ -239,7 +196,7 @@ iscsi_hdr_extract(struct iscsi_conn *conn) static void __iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct iscsi_session *session = conn->session; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct scsi_cmnd *sc; sc = ctask->sc; @@ -248,88 +205,16 @@ __iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) if (sc->sc_data_direction == DMA_TO_DEVICE) { struct iscsi_data_task *dtask, *n; + /* WRITE: cleanup Data-Out's if any */ - list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) { + list_for_each_entry_safe(dtask, n, &tcp_ctask->dataqueue, + item) { list_del(&dtask->item); - mempool_free(dtask, ctask->datapool); + mempool_free(dtask, tcp_ctask->datapool); } } - ctask->xmstate = XMSTATE_IDLE; - ctask->r2t = NULL; - ctask->sc = NULL; - list_del(&ctask->running); - - __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); - - sc->scsi_done(sc); -} - -static void -iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - struct iscsi_session *session = conn->session; - - spin_lock(&session->lock); - __iscsi_ctask_cleanup(conn, ctask); - spin_unlock(&session->lock); -} - -/** - * iscsi_cmd_rsp - SCSI Command Response processing - * @conn: iscsi connection - * @ctask: scsi command task - **/ -static int -iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) -{ - int rc; - struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr; - struct iscsi_session *session = conn->session; - struct scsi_cmnd *sc = ctask->sc; - - rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); - if (rc) { - sc->result = (DID_ERROR << 16); - goto out; - } - - conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; - - sc->result = (DID_OK << 16) | rhdr->cmd_status; - - if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { - sc->result = (DID_ERROR << 16); - goto out; - } - - if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) { - int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE); - - memcpy(sc->sense_buffer, conn->data + 2, sensecopy); - debug_scsi("copied %d bytes of sense\n", sensecopy); - } - - if (sc->sc_data_direction == DMA_TO_DEVICE) - goto out; - - if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { - int res_count = be32_to_cpu(rhdr->residual_count); - - if (res_count > 0 && res_count <= sc->request_bufflen) - sc->resid = res_count; - else - sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) - sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; - else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) - sc->resid = be32_to_cpu(rhdr->residual_count); - -out: - debug_scsi("done [sc %lx res %d itt 0x%x]\n", - (long)sc, sc->result, ctask->itt); - conn->scsirsp_pdus_cnt++; - iscsi_ctask_cleanup(conn, ctask); - return rc; + tcp_ctask->xmstate = XMSTATE_IDLE; + tcp_ctask->r2t = NULL; } /** @@ -341,7 +226,9 @@ static int iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { int rc; - struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr; struct iscsi_session *session = conn->session; int datasn = be32_to_cpu(rhdr->datasn); @@ -351,9 +238,9 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) /* * setup Data-In byte counter (gets decremented..) */ - ctask->data_count = conn->in.datalen; + ctask->data_count = tcp_conn->in.datalen; - if (conn->in.datalen == 0) + if (tcp_conn->in.datalen == 0) return 0; if (ctask->datasn != datasn) @@ -361,8 +248,8 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) ctask->datasn++; - ctask->data_offset = be32_to_cpu(rhdr->offset); - if (ctask->data_offset + conn->in.datalen > ctask->total_length) + tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); + if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) return ISCSI_ERR_DATA_OFFSET; if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) { @@ -409,8 +296,9 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, struct iscsi_data *hdr; struct iscsi_data_task *dtask; struct scsi_cmnd *sc = ctask->sc; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); INIT_LIST_HEAD(&dtask->item); hdr = &dtask->hdr; @@ -419,8 +307,8 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, hdr->datasn = cpu_to_be32(r2t->solicit_datasn); r2t->solicit_datasn++; hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + hdr->itt = ctask->hdr->itt; hdr->exp_statsn = r2t->exp_statsn; hdr->offset = cpu_to_be32(r2t->data_offset); if (r2t->data_length > conn->max_xmit_dlength) { @@ -469,11 +357,11 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, } BUG_ON(r2t->sg == NULL); } else - iscsi_buf_init_iov(&ctask->sendbuf, + iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)sc->request_buffer + r2t->data_offset, r2t->data_count); - list_add(&dtask->item, &ctask->dataqueue); + list_add(&dtask->item, &tcp_ctask->dataqueue); } /** @@ -486,17 +374,16 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_r2t_info *r2t; struct iscsi_session *session = conn->session; - struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr; int r2tsn = be32_to_cpu(rhdr->r2tsn); int rc; - if (conn->in.ahslen) - return ISCSI_ERR_AHSLEN; - - if (conn->in.datalen) + if (tcp_conn->in.datalen) return ISCSI_ERR_DATALEN; - if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn) + if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) return ISCSI_ERR_R2TSN; rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); @@ -514,7 +401,7 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) spin_unlock(&session->lock); return 0; } - rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); + rc = __kfifo_get(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); BUG_ON(!rc); r2t->exp_statsn = rhdr->statsn; @@ -536,10 +423,10 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) iscsi_solicit_data_init(conn, ctask, r2t); - ctask->exp_r2tsn = r2tsn + 1; - ctask->xmstate |= XMSTATE_SOL_HDR; - __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*)); - __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*)); + tcp_ctask->exp_r2tsn = r2tsn + 1; + tcp_ctask->xmstate |= XMSTATE_SOL_HDR; + __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); + __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); scsi_queue_work(session->host, &conn->xmitwork); conn->r2t_pdus_cnt++; @@ -549,256 +436,136 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) } static int -iscsi_hdr_recv(struct iscsi_conn *conn) +iscsi_tcp_hdr_recv(struct iscsi_conn *conn) { - int rc = 0; + int rc = 0, opcode, ahslen; struct iscsi_hdr *hdr; - struct iscsi_cmd_task *ctask; struct iscsi_session *session = conn->session; - uint32_t cdgst, rdgst = 0; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + uint32_t cdgst, rdgst = 0, itt; - hdr = conn->in.hdr; + hdr = tcp_conn->in.hdr; /* verify PDU length */ - conn->in.datalen = ntoh24(hdr->dlength); - if (conn->in.datalen > conn->max_recv_dlength) { + tcp_conn->in.datalen = ntoh24(hdr->dlength); + if (tcp_conn->in.datalen > conn->max_recv_dlength) { printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n", - conn->in.datalen, conn->max_recv_dlength); + tcp_conn->in.datalen, conn->max_recv_dlength); return ISCSI_ERR_DATALEN; } - conn->data_copied = 0; + tcp_conn->data_copied = 0; /* read AHS */ - conn->in.ahslen = hdr->hlength * 4; - conn->in.offset += conn->in.ahslen; - conn->in.copy -= conn->in.ahslen; - if (conn->in.copy < 0) { + ahslen = hdr->hlength << 2; + tcp_conn->in.offset += ahslen; + tcp_conn->in.copy -= ahslen; + if (tcp_conn->in.copy < 0) { printk(KERN_ERR "iscsi_tcp: can't handle AHS with length " - "%d bytes\n", conn->in.ahslen); + "%d bytes\n", ahslen); return ISCSI_ERR_AHSLEN; } /* calculate read padding */ - conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1); - if (conn->in.padding) { - conn->in.padding = ISCSI_PAD_LEN - conn->in.padding; - debug_scsi("read padding %d bytes\n", conn->in.padding); + tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1); + if (tcp_conn->in.padding) { + tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding; + debug_scsi("read padding %d bytes\n", tcp_conn->in.padding); } if (conn->hdrdgst_en) { struct scatterlist sg; sg_init_one(&sg, (u8 *)hdr, - sizeof(struct iscsi_hdr) + conn->in.ahslen); - crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst); + sizeof(struct iscsi_hdr) + ahslen); + crypto_digest_digest(tcp_conn->rx_tfm, &sg, 1, (u8 *)&cdgst); rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) + - conn->in.ahslen); + ahslen); if (cdgst != rdgst) { - printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error " - "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst, - cdgst); + printk(KERN_ERR "iscsi_tcp: hdrdgst error " + "recv 0x%x calc 0x%x\n", rdgst, cdgst); return ISCSI_ERR_HDR_DGST; } } - /* save opcode for later */ - conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK; - + opcode = hdr->opcode & ISCSI_OPCODE_MASK; /* verify itt (itt encoding: age+cid+itt) */ - if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { - if ((hdr->itt & AGE_MASK) != - (session->age << AGE_SHIFT)) { - printk(KERN_ERR "iscsi_tcp: received itt %x expected " - "session age (%x)\n", hdr->itt, - session->age & AGE_MASK); - return ISCSI_ERR_BAD_ITT; - } - - if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) { - printk(KERN_ERR "iscsi_tcp: received itt %x, expected " - "CID (%x)\n", hdr->itt, conn->id); - return ISCSI_ERR_BAD_ITT; - } - conn->in.itt = hdr->itt & ITT_MASK; - } else - conn->in.itt = hdr->itt; + rc = iscsi_verify_itt(conn, hdr, &itt); + if (rc == ISCSI_ERR_NO_SCSI_CMD) { + tcp_conn->in.datalen = 0; /* force drop */ + return 0; + } else if (rc) + return rc; debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n", - hdr->opcode, conn->in.offset, conn->in.copy, - conn->in.ahslen, conn->in.datalen); - - if (conn->in.itt < session->cmds_max) { - ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt]; - - if (!ctask->sc) { - printk(KERN_INFO "iscsi_tcp: dropping ctask with " - "itt 0x%x\n", ctask->itt); - conn->in.datalen = 0; /* force drop */ - return 0; - } - - if (ctask->sc->SCp.phase != session->age) { - printk(KERN_ERR "iscsi_tcp: ctask's session age %d, " - "expected %d\n", ctask->sc->SCp.phase, - session->age); - return ISCSI_ERR_SESSION_FAILED; - } - - conn->in.ctask = ctask; - - debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n", - hdr->opcode, conn->id, (long)ctask->sc, - ctask->itt, conn->in.datalen); - - switch(conn->in.opcode) { - case ISCSI_OP_SCSI_CMD_RSP: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - if (!conn->in.datalen) - rc = iscsi_cmd_rsp(conn, ctask); - else - /* - * got sense or response data; copying PDU - * Header to the connection's header - * placeholder - */ - memcpy(&conn->hdr, hdr, - sizeof(struct iscsi_hdr)); - break; - case ISCSI_OP_SCSI_DATA_IN: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - /* save flags for non-exceptional status */ - conn->in.flags = hdr->flags; - /* save cmd_status for sense data */ - conn->in.cmd_status = - ((struct iscsi_data_rsp*)hdr)->cmd_status; - rc = iscsi_data_rsp(conn, ctask); - break; - case ISCSI_OP_R2T: - BUG_ON((void*)ctask != ctask->sc->SCp.ptr); - if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) - rc = iscsi_r2t_rsp(conn, ctask); - else - rc = ISCSI_ERR_PROTO; - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET && - conn->in.itt < ISCSI_MGMT_ITT_OFFSET + - session->mgmtpool_max) { - struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - - debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", - conn->in.opcode, conn->id, mtask->itt, - conn->in.datalen); - - switch(conn->in.opcode) { - case ISCSI_OP_LOGIN_RSP: - case ISCSI_OP_TEXT_RSP: - case ISCSI_OP_LOGOUT_RSP: - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; + opcode, tcp_conn->in.offset, tcp_conn->in.copy, + ahslen, tcp_conn->in.datalen); - if (!conn->in.datalen) { - rc = iscsi_recv_pdu(conn->cls_conn, hdr, - NULL, 0); - if (conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - case ISCSI_OP_SCSI_TMFUNC_RSP: - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; + switch(opcode) { + case ISCSI_OP_SCSI_DATA_IN: + tcp_conn->in.ctask = session->cmds[itt]; + rc = iscsi_data_rsp(conn, tcp_conn->in.ctask); + /* fall through */ + case ISCSI_OP_SCSI_CMD_RSP: + tcp_conn->in.ctask = session->cmds[itt]; + if (tcp_conn->in.datalen) + goto copy_hdr; - if (conn->in.datalen || conn->in.ahslen) { - rc = ISCSI_ERR_PROTO; - break; - } - conn->tmfrsp_pdus_cnt++; - spin_lock(&session->lock); - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmabort_state = - ((struct iscsi_tm_rsp *)hdr)-> - response == ISCSI_TMF_RSP_COMPLETE ? - TMABORT_SUCCESS:TMABORT_FAILED; - /* unblock eh_abort() */ - wake_up(&conn->ehwait); - } - spin_unlock(&session->lock); - break; - case ISCSI_OP_NOOP_IN: - if (hdr->ttt != ISCSI_RESERVED_TAG) { - rc = ISCSI_ERR_PROTO; - break; - } - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (rc) - break; - conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; - - if (!conn->in.datalen) { - struct iscsi_mgmt_task *mtask; - - rc = iscsi_recv_pdu(conn->cls_conn, hdr, - NULL, 0); - mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - if (conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else if (conn->in.itt == ISCSI_RESERVED_TAG) { - switch(conn->in.opcode) { - case ISCSI_OP_NOOP_IN: - if (!conn->in.datalen) { - rc = iscsi_check_assign_cmdsn(session, - (struct iscsi_nopin*)hdr); - if (!rc && hdr->ttt != ISCSI_RESERVED_TAG) - rc = iscsi_recv_pdu(conn->cls_conn, - hdr, NULL, 0); - } else - rc = ISCSI_ERR_PROTO; - break; - case ISCSI_OP_REJECT: - /* we need sth like iscsi_reject_rsp()*/ - case ISCSI_OP_ASYNC_EVENT: - /* we need sth like iscsi_async_event_rsp() */ - rc = ISCSI_ERR_BAD_OPCODE; - break; - default: - rc = ISCSI_ERR_BAD_OPCODE; - break; - } - } else - rc = ISCSI_ERR_BAD_ITT; + spin_lock(&session->lock); + __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); + rc = __iscsi_complete_pdu(conn, hdr, NULL, 0); + spin_unlock(&session->lock); + break; + case ISCSI_OP_R2T: + tcp_conn->in.ctask = session->cmds[itt]; + if (ahslen) + rc = ISCSI_ERR_AHSLEN; + else if (tcp_conn->in.ctask->sc->sc_data_direction == + DMA_TO_DEVICE) + rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask); + else + rc = ISCSI_ERR_PROTO; + break; + case ISCSI_OP_LOGIN_RSP: + case ISCSI_OP_TEXT_RSP: + case ISCSI_OP_LOGOUT_RSP: + case ISCSI_OP_NOOP_IN: + case ISCSI_OP_REJECT: + case ISCSI_OP_ASYNC_EVENT: + if (tcp_conn->in.datalen) + goto copy_hdr; + /* fall through */ + case ISCSI_OP_SCSI_TMFUNC_RSP: + rc = iscsi_complete_pdu(conn, hdr, NULL, 0); + break; + default: + rc = ISCSI_ERR_BAD_OPCODE; + break; + } return rc; + +copy_hdr: + /* + * if we did zero copy for the header but we will need multiple + * skbs to complete the command then we have to copy the header + * for later use + */ + if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy < + (tcp_conn->in.datalen + tcp_conn->in.padding + + (conn->datadgst_en ? 4 : 0))) { + debug_tcp("Copying header for later use. in.copy %d in.datalen" + " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen); + memcpy(&tcp_conn->hdr, tcp_conn->in.hdr, + sizeof(struct iscsi_hdr)); + tcp_conn->in.hdr = &tcp_conn->hdr; + tcp_conn->in.zero_copy_hdr = 0; + } + return 0; } /** * iscsi_ctask_copy - copy skb bits to the destanation cmd task - * @conn: iscsi connection + * @conn: iscsi tcp connection * @ctask: scsi command task * @buf: buffer to copy to * @buf_size: size of buffer @@ -820,110 +587,113 @@ iscsi_hdr_recv(struct iscsi_conn *conn) * buf_left left to copy from in progress buffer **/ static inline int -iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, +iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask, void *buf, int buf_size, int offset) { - int buf_left = buf_size - (conn->data_copied + offset); - int size = min(conn->in.copy, buf_left); + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + int buf_left = buf_size - (tcp_conn->data_copied + offset); + int size = min(tcp_conn->in.copy, buf_left); int rc; size = min(size, ctask->data_count); debug_tcp("ctask_copy %d bytes at offset %d copied %d\n", - size, conn->in.offset, conn->in.copied); + size, tcp_conn->in.offset, tcp_conn->in.copied); BUG_ON(size <= 0); - BUG_ON(ctask->sent + size > ctask->total_length); + BUG_ON(tcp_ctask->sent + size > ctask->total_length); - rc = skb_copy_bits(conn->in.skb, conn->in.offset, - (char*)buf + (offset + conn->data_copied), size); + rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, + (char*)buf + (offset + tcp_conn->data_copied), size); /* must fit into skb->len */ BUG_ON(rc); - conn->in.offset += size; - conn->in.copy -= size; - conn->in.copied += size; - conn->data_copied += size; - ctask->sent += size; + tcp_conn->in.offset += size; + tcp_conn->in.copy -= size; + tcp_conn->in.copied += size; + tcp_conn->data_copied += size; + tcp_ctask->sent += size; ctask->data_count -= size; - BUG_ON(conn->in.copy < 0); + BUG_ON(tcp_conn->in.copy < 0); BUG_ON(ctask->data_count < 0); - if (buf_size != (conn->data_copied + offset)) { + if (buf_size != (tcp_conn->data_copied + offset)) { if (!ctask->data_count) { - BUG_ON(buf_size - conn->data_copied < 0); + BUG_ON(buf_size - tcp_conn->data_copied < 0); /* done with this PDU */ - return buf_size - conn->data_copied; + return buf_size - tcp_conn->data_copied; } return -EAGAIN; } /* done with this buffer or with both - PDU and buffer */ - conn->data_copied = 0; + tcp_conn->data_copied = 0; return 0; } /** * iscsi_tcp_copy - copy skb bits to the destanation buffer - * @conn: iscsi connection - * @buf: buffer to copy to - * @buf_size: number of bytes to copy + * @conn: iscsi tcp connection * * Notes: * The function calls skb_copy_bits() and updates per-connection * byte counters. **/ static inline int -iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size) +iscsi_tcp_copy(struct iscsi_tcp_conn *tcp_conn) { - int buf_left = buf_size - conn->data_copied; - int size = min(conn->in.copy, buf_left); + void *buf = tcp_conn->data; + int buf_size = tcp_conn->in.datalen; + int buf_left = buf_size - tcp_conn->data_copied; + int size = min(tcp_conn->in.copy, buf_left); int rc; debug_tcp("tcp_copy %d bytes at offset %d copied %d\n", - size, conn->in.offset, conn->data_copied); + size, tcp_conn->in.offset, tcp_conn->data_copied); BUG_ON(size <= 0); - rc = skb_copy_bits(conn->in.skb, conn->in.offset, - (char*)buf + conn->data_copied, size); + rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, + (char*)buf + tcp_conn->data_copied, size); BUG_ON(rc); - conn->in.offset += size; - conn->in.copy -= size; - conn->in.copied += size; - conn->data_copied += size; + tcp_conn->in.offset += size; + tcp_conn->in.copy -= size; + tcp_conn->in.copied += size; + tcp_conn->data_copied += size; - if (buf_size != conn->data_copied) + if (buf_size != tcp_conn->data_copied) return -EAGAIN; return 0; } static inline void -partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg, - int offset, int length) +partial_sg_digest_update(struct iscsi_tcp_conn *tcp_conn, + struct scatterlist *sg, int offset, int length) { struct scatterlist temp; memcpy(&temp, sg, sizeof(struct scatterlist)); temp.offset = offset; temp.length = length; - crypto_digest_update(conn->data_rx_tfm, &temp, 1); + crypto_digest_update(tcp_conn->data_rx_tfm, &temp, 1); } static void -iscsi_recv_digest_update(struct iscsi_conn *conn, char* buf, int len) +iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len) { struct scatterlist tmp; sg_init_one(&tmp, buf, len); - crypto_digest_update(conn->data_rx_tfm, &tmp, 1); + crypto_digest_update(tcp_conn->data_rx_tfm, &tmp, 1); } static int iscsi_scsi_data_in(struct iscsi_conn *conn) { - struct iscsi_cmd_task *ctask = conn->in.ctask; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_cmd_task *ctask = tcp_conn->in.ctask; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct scsi_cmnd *sc = ctask->sc; struct scatterlist *sg; int i, offset, rc = 0; @@ -935,31 +705,33 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn) */ if (!sc->use_sg) { i = ctask->data_count; - rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer, - sc->request_bufflen, ctask->data_offset); + rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer, + sc->request_bufflen, + tcp_ctask->data_offset); if (rc == -EAGAIN) return rc; if (conn->datadgst_en) - iscsi_recv_digest_update(conn, sc->request_buffer, i); + iscsi_recv_digest_update(tcp_conn, sc->request_buffer, + i); rc = 0; goto done; } - offset = ctask->data_offset; + offset = tcp_ctask->data_offset; sg = sc->request_buffer; - if (ctask->data_offset) - for (i = 0; i < ctask->sg_count; i++) + if (tcp_ctask->data_offset) + for (i = 0; i < tcp_ctask->sg_count; i++) offset -= sg[i].length; /* we've passed through partial sg*/ if (offset < 0) offset = 0; - for (i = ctask->sg_count; i < sc->use_sg; i++) { + for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) { char *dest; dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0); - rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset, + rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset, sg[i].length, offset); kunmap_atomic(dest, KM_SOFTIRQ0); if (rc == -EAGAIN) @@ -968,15 +740,17 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn) if (!rc) { if (conn->datadgst_en) { if (!offset) - crypto_digest_update(conn->data_rx_tfm, - &sg[i], 1); + crypto_digest_update( + tcp_conn->data_rx_tfm, + &sg[i], 1); else - partial_sg_digest_update(conn, &sg[i], + partial_sg_digest_update(tcp_conn, + &sg[i], sg[i].offset + offset, sg[i].length - offset); } offset = 0; - ctask->sg_count++; + tcp_ctask->sg_count++; } if (!ctask->data_count) { @@ -984,24 +758,26 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn) /* * data-in is complete, but buffer not... */ - partial_sg_digest_update(conn, &sg[i], + partial_sg_digest_update(tcp_conn, &sg[i], sg[i].offset, sg[i].length-rc); rc = 0; break; } - if (!conn->in.copy) + if (!tcp_conn->in.copy) return -EAGAIN; } BUG_ON(ctask->data_count); done: /* check for non-exceptional status */ - if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) { + if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) { debug_scsi("done [sc %lx res %d itt 0x%x]\n", (long)sc, sc->result, ctask->itt); - conn->scsirsp_pdus_cnt++; - iscsi_ctask_cleanup(conn, ctask); + spin_lock(&conn->session->lock); + __iscsi_ctask_cleanup(conn, ctask); + __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0); + spin_unlock(&conn->session->lock); } return rc; @@ -1010,71 +786,38 @@ done: static int iscsi_data_recv(struct iscsi_conn *conn) { - struct iscsi_session *session = conn->session; - int rc = 0; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + int rc = 0, opcode; - switch(conn->in.opcode) { + opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK; + switch (opcode) { case ISCSI_OP_SCSI_DATA_IN: rc = iscsi_scsi_data_in(conn); break; - case ISCSI_OP_SCSI_CMD_RSP: { - /* - * SCSI Sense Data: - * copying the entire Data Segment. - */ - if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) { - rc = -EAGAIN; - goto exit; - } - - /* - * check for sense - */ - conn->in.hdr = &conn->hdr; - conn->senselen = (conn->data[0] << 8) | conn->data[1]; - rc = iscsi_cmd_rsp(conn, conn->in.ctask); - if (!rc && conn->datadgst_en) - iscsi_recv_digest_update(conn, conn->data, - conn->in.datalen); - } - break; + case ISCSI_OP_SCSI_CMD_RSP: + spin_lock(&conn->session->lock); + __iscsi_ctask_cleanup(conn, tcp_conn->in.ctask); + spin_unlock(&conn->session->lock); case ISCSI_OP_TEXT_RSP: case ISCSI_OP_LOGIN_RSP: - case ISCSI_OP_NOOP_IN: { - struct iscsi_mgmt_task *mtask = NULL; - - if (conn->in.itt != ISCSI_RESERVED_TAG) - mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[conn->in.itt - - ISCSI_MGMT_ITT_OFFSET]; - + case ISCSI_OP_NOOP_IN: + case ISCSI_OP_ASYNC_EVENT: + case ISCSI_OP_REJECT: /* * Collect data segment to the connection's data * placeholder */ - if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) { + if (iscsi_tcp_copy(tcp_conn)) { rc = -EAGAIN; goto exit; } - rc = iscsi_recv_pdu(conn->cls_conn, conn->in.hdr, - conn->data, conn->in.datalen); - - if (!rc && conn->datadgst_en && - conn->in.opcode != ISCSI_OP_LOGIN_RSP) - iscsi_recv_digest_update(conn, conn->data, - conn->in.datalen); - - if (mtask && conn->login_mtask != mtask) { - spin_lock(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&mtask, - sizeof(void*)); - spin_unlock(&session->lock); - } - } - break; - case ISCSI_OP_ASYNC_EVENT: - case ISCSI_OP_REJECT: + rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, tcp_conn->data, + tcp_conn->in.datalen); + if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP) + iscsi_recv_digest_update(tcp_conn, tcp_conn->data, + tcp_conn->in.datalen); + break; default: BUG_ON(1); } @@ -1095,6 +838,7 @@ iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, { int rc; struct iscsi_conn *conn = rd_desc->arg.data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; int processed; char pad[ISCSI_PAD_LEN]; struct scatterlist sg; @@ -1103,15 +847,15 @@ iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, * Save current SKB and its offset in the corresponding * connection context. */ - conn->in.copy = skb->len - offset; - conn->in.offset = offset; - conn->in.skb = skb; - conn->in.len = conn->in.copy; - BUG_ON(conn->in.copy <= 0); - debug_tcp("in %d bytes\n", conn->in.copy); + tcp_conn->in.copy = skb->len - offset; + tcp_conn->in.offset = offset; + tcp_conn->in.skb = skb; + tcp_conn->in.len = tcp_conn->in.copy; + BUG_ON(tcp_conn->in.copy <= 0); + debug_tcp("in %d bytes\n", tcp_conn->in.copy); more: - conn->in.copied = 0; + tcp_conn->in.copied = 0; rc = 0; if (unlikely(conn->suspend_rx)) { @@ -1119,9 +863,9 @@ more: return 0; } - if (conn->in_progress == IN_PROGRESS_WAIT_HEADER || - conn->in_progress == IN_PROGRESS_HEADER_GATHER) { - rc = iscsi_hdr_extract(conn); + if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER || + tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) { + rc = iscsi_hdr_extract(tcp_conn); if (rc) { if (rc == -EAGAIN) goto nomore; @@ -1134,90 +878,94 @@ more: /* * Verify and process incoming PDU header. */ - rc = iscsi_hdr_recv(conn); - if (!rc && conn->in.datalen) { + rc = iscsi_tcp_hdr_recv(conn); + if (!rc && tcp_conn->in.datalen) { if (conn->datadgst_en) { - BUG_ON(!conn->data_rx_tfm); - crypto_digest_init(conn->data_rx_tfm); + BUG_ON(!tcp_conn->data_rx_tfm); + crypto_digest_init(tcp_conn->data_rx_tfm); } - conn->in_progress = IN_PROGRESS_DATA_RECV; + tcp_conn->in_progress = IN_PROGRESS_DATA_RECV; } else if (rc) { iscsi_conn_failure(conn, rc); return 0; } } - if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { + if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV) { uint32_t recv_digest; + debug_tcp("extra data_recv offset %d copy %d\n", - conn->in.offset, conn->in.copy); - skb_copy_bits(conn->in.skb, conn->in.offset, + tcp_conn->in.offset, tcp_conn->in.copy); + skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset, &recv_digest, 4); - conn->in.offset += 4; - conn->in.copy -= 4; - if (recv_digest != conn->in.datadgst) { + tcp_conn->in.offset += 4; + tcp_conn->in.copy -= 4; + if (recv_digest != tcp_conn->in.datadgst) { debug_tcp("iscsi_tcp: data digest error!" "0x%x != 0x%x\n", recv_digest, - conn->in.datadgst); + tcp_conn->in.datadgst); iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST); return 0; } else { debug_tcp("iscsi_tcp: data digest match!" "0x%x == 0x%x\n", recv_digest, - conn->in.datadgst); - conn->in_progress = IN_PROGRESS_WAIT_HEADER; + tcp_conn->in.datadgst); + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; } } - if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) { + if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV && + tcp_conn->in.copy) { debug_tcp("data_recv offset %d copy %d\n", - conn->in.offset, conn->in.copy); + tcp_conn->in.offset, tcp_conn->in.copy); rc = iscsi_data_recv(conn); if (rc) { if (rc == -EAGAIN) { - rd_desc->count = conn->in.datalen - - conn->in.ctask->data_count; + rd_desc->count = tcp_conn->in.datalen - + tcp_conn->in.ctask->data_count; goto again; } iscsi_conn_failure(conn, rc); return 0; } - conn->in.copy -= conn->in.padding; - conn->in.offset += conn->in.padding; + tcp_conn->in.copy -= tcp_conn->in.padding; + tcp_conn->in.offset += tcp_conn->in.padding; if (conn->datadgst_en) { - if (conn->in.padding) { - debug_tcp("padding -> %d\n", conn->in.padding); - memset(pad, 0, conn->in.padding); - sg_init_one(&sg, pad, conn->in.padding); - crypto_digest_update(conn->data_rx_tfm, &sg, 1); + if (tcp_conn->in.padding) { + debug_tcp("padding -> %d\n", + tcp_conn->in.padding); + memset(pad, 0, tcp_conn->in.padding); + sg_init_one(&sg, pad, tcp_conn->in.padding); + crypto_digest_update(tcp_conn->data_rx_tfm, + &sg, 1); } - crypto_digest_final(conn->data_rx_tfm, - (u8 *) & conn->in.datadgst); - debug_tcp("rx digest 0x%x\n", conn->in.datadgst); - conn->in_progress = IN_PROGRESS_DDIGEST_RECV; + crypto_digest_final(tcp_conn->data_rx_tfm, + (u8 *) & tcp_conn->in.datadgst); + debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst); + tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV; } else - conn->in_progress = IN_PROGRESS_WAIT_HEADER; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; } debug_tcp("f, processed %d from out of %d padding %d\n", - conn->in.offset - offset, (int)len, conn->in.padding); - BUG_ON(conn->in.offset - offset > len); + tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding); + BUG_ON(tcp_conn->in.offset - offset > len); - if (conn->in.offset - offset != len) { + if (tcp_conn->in.offset - offset != len) { debug_tcp("continue to process %d bytes\n", - (int)len - (conn->in.offset - offset)); + (int)len - (tcp_conn->in.offset - offset)); goto more; } nomore: - processed = conn->in.offset - offset; + processed = tcp_conn->in.offset - offset; BUG_ON(processed == 0); return processed; again: - processed = conn->in.offset - offset; + processed = tcp_conn->in.offset - offset; debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n", processed, (int)len, (int)rd_desc->count); BUG_ON(processed == 0); @@ -1246,6 +994,7 @@ iscsi_tcp_data_ready(struct sock *sk, int flag) static void iscsi_tcp_state_change(struct sock *sk) { + struct iscsi_tcp_conn *tcp_conn; struct iscsi_conn *conn; struct iscsi_session *session; void (*old_state_change)(struct sock *); @@ -1262,7 +1011,8 @@ iscsi_tcp_state_change(struct sock *sk) iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); } - old_state_change = conn->old_state_change; + tcp_conn = conn->dd_data; + old_state_change = tcp_conn->old_state_change; read_unlock(&sk->sk_callback_lock); @@ -1277,23 +1027,26 @@ static void iscsi_write_space(struct sock *sk) { struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data; - conn->old_write_space(sk); + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + + tcp_conn->old_write_space(sk); debug_tcp("iscsi_write_space: cid %d\n", conn->id); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); + clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); scsi_queue_work(conn->session->host, &conn->xmitwork); } static void iscsi_conn_set_callbacks(struct iscsi_conn *conn) { - struct sock *sk = conn->sock->sk; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk = tcp_conn->sock->sk; /* assign new callbacks */ write_lock_bh(&sk->sk_callback_lock); sk->sk_user_data = conn; - conn->old_data_ready = sk->sk_data_ready; - conn->old_state_change = sk->sk_state_change; - conn->old_write_space = sk->sk_write_space; + tcp_conn->old_data_ready = sk->sk_data_ready; + tcp_conn->old_state_change = sk->sk_state_change; + tcp_conn->old_write_space = sk->sk_write_space; sk->sk_data_ready = iscsi_tcp_data_ready; sk->sk_state_change = iscsi_tcp_state_change; sk->sk_write_space = iscsi_write_space; @@ -1303,14 +1056,15 @@ iscsi_conn_set_callbacks(struct iscsi_conn *conn) static void iscsi_conn_restore_callbacks(struct iscsi_conn *conn) { - struct sock *sk = conn->sock->sk; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct sock *sk = tcp_conn->sock->sk; /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ write_lock_bh(&sk->sk_callback_lock); sk->sk_user_data = NULL; - sk->sk_data_ready = conn->old_data_ready; - sk->sk_state_change = conn->old_state_change; - sk->sk_write_space = conn->old_write_space; + sk->sk_data_ready = tcp_conn->old_data_ready; + sk->sk_state_change = tcp_conn->old_state_change; + sk->sk_write_space = tcp_conn->old_write_space; sk->sk_no_check = 0; write_unlock_bh(&sk->sk_callback_lock); } @@ -1325,7 +1079,8 @@ iscsi_conn_restore_callbacks(struct iscsi_conn *conn) static inline int iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) { - struct socket *sk = conn->sock; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct socket *sk = tcp_conn->sock; int offset = buf->sg.offset + buf->sent; /* @@ -1339,7 +1094,8 @@ iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) if (buf->use_sendmsg) return sock_no_sendpage(sk, buf->sg.page, offset, size, flags); else - return conn->sendpage(sk, buf->sg.page, offset, size, flags); + return tcp_conn->sendpage(sk, buf->sg.page, offset, size, + flags); } /** @@ -1354,6 +1110,7 @@ iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) static inline int iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) { + struct iscsi_tcp_conn *tcp_conn; int flags = 0; /* MSG_DONTWAIT; */ int res, size; @@ -1371,8 +1128,9 @@ iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) return -EAGAIN; return 0; } else if (res == -EAGAIN) { - conn->sendpage_failures_cnt++; - set_bit(SUSPEND_BIT, &conn->suspend_tx); + tcp_conn = conn->dd_data; + tcp_conn->sendpage_failures_cnt++; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); } else if (res == -EPIPE) iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); @@ -1393,6 +1151,7 @@ static inline int iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, int *count, int *sent) { + struct iscsi_tcp_conn *tcp_conn; int flags = 0; /* MSG_DONTWAIT; */ int res, size; @@ -1415,8 +1174,9 @@ iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, return -EAGAIN; return 0; } else if (res == -EAGAIN) { - conn->sendpage_failures_cnt++; - set_bit(SUSPEND_BIT, &conn->suspend_tx); + tcp_conn = conn->dd_data; + tcp_conn->sendpage_failures_cnt++; + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); } else if (res == -EPIPE) iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); @@ -1424,30 +1184,35 @@ iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, } static inline void -iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn, + struct iscsi_cmd_task *ctask) { - BUG_ON(!conn->data_tx_tfm); - crypto_digest_init(conn->data_tx_tfm); - ctask->digest_count = 4; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + BUG_ON(!tcp_conn->data_tx_tfm); + crypto_digest_init(tcp_conn->data_tx_tfm); + tcp_ctask->digest_count = 4; } static int iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, struct iscsi_buf *buf, uint32_t *digest, int final) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; int rc = 0; int sent = 0; if (final) - crypto_digest_final(conn->data_tx_tfm, (u8*)digest); + crypto_digest_final(tcp_conn->data_tx_tfm, (u8*)digest); iscsi_buf_init_virt(buf, (char*)digest, 4); - rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent); + rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent); if (rc) { - ctask->datadigest = *digest; - ctask->xmstate |= XMSTATE_DATA_DIGEST; + tcp_ctask->datadigest = *digest; + tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; } else - ctask->digest_count = 4; + tcp_ctask->digest_count = 4; return rc; } @@ -1468,12 +1233,13 @@ static void iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, struct iscsi_r2t_info *r2t, int left) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_data *hdr; struct iscsi_data_task *dtask; struct scsi_cmnd *sc = ctask->sc; int new_offset; - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); INIT_LIST_HEAD(&dtask->item); hdr = &dtask->hdr; @@ -1482,8 +1248,8 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, hdr->datasn = cpu_to_be32(r2t->solicit_datasn); r2t->solicit_datasn++; hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; + memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); + hdr->itt = ctask->hdr->itt; hdr->exp_statsn = r2t->exp_statsn; new_offset = r2t->data_offset + r2t->sent; hdr->offset = cpu_to_be32(new_offset); @@ -1503,177 +1269,102 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, r2t->dtask = dtask; if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) { - BUG_ON(ctask->bad_sg == r2t->sg); + BUG_ON(tcp_ctask->bad_sg == r2t->sg); iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); r2t->sg += 1; } else - iscsi_buf_init_iov(&ctask->sendbuf, + iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)sc->request_buffer + new_offset, r2t->data_count); - list_add(&dtask->item, &ctask->dataqueue); + list_add(&dtask->item, &tcp_ctask->dataqueue); } static void iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct iscsi_data *hdr; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_data_task *dtask; - dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC); + dtask = mempool_alloc(tcp_ctask->datapool, GFP_ATOMIC); BUG_ON(!dtask); INIT_LIST_HEAD(&dtask->item); - hdr = &dtask->hdr; - memset(hdr, 0, sizeof(struct iscsi_data)); - hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); - hdr->datasn = cpu_to_be32(ctask->unsol_datasn); - ctask->unsol_datasn++; - hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->itt = ctask->hdr.itt; - hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); - hdr->offset = cpu_to_be32(ctask->total_length - - ctask->r2t_data_count - - ctask->unsol_count); - if (ctask->unsol_count > conn->max_xmit_dlength) { - hton24(hdr->dlength, conn->max_xmit_dlength); - ctask->data_count = conn->max_xmit_dlength; - hdr->flags = 0; - } else { - hton24(hdr->dlength, ctask->unsol_count); - ctask->data_count = ctask->unsol_count; - hdr->flags = ISCSI_FLAG_CMD_FINAL; - } - iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr, + iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr, + tcp_ctask->r2t_data_count); + iscsi_buf_init_virt(&tcp_ctask->headbuf, (char*)&dtask->hdr, sizeof(struct iscsi_hdr)); - list_add(&dtask->item, &ctask->dataqueue); - - ctask->dtask = dtask; + list_add(&dtask->item, &tcp_ctask->dataqueue); + tcp_ctask->dtask = dtask; } /** - * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands + * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands * @conn: iscsi connection * @ctask: scsi command task * @sc: scsi command **/ static void -iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, - struct scsi_cmnd *sc) +iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) { - struct iscsi_session *session = conn->session; - - BUG_ON(__kfifo_len(ctask->r2tqueue)); - - INIT_LIST_HEAD(&ctask->running); - ctask->sc = sc; - ctask->conn = conn; - ctask->hdr.opcode = ISCSI_OP_SCSI_CMD; - ctask->hdr.flags = ISCSI_ATTR_SIMPLE; - int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun); - ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) | - (session->age << AGE_SHIFT); - ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen); - ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++; - ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn); - memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len); - memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); + struct scsi_cmnd *sc = ctask->sc; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; - ctask->mtask = NULL; - ctask->sent = 0; - ctask->sg_count = 0; + BUG_ON(__kfifo_len(tcp_ctask->r2tqueue)); - ctask->total_length = sc->request_bufflen; + tcp_ctask->sent = 0; + tcp_ctask->sg_count = 0; if (sc->sc_data_direction == DMA_TO_DEVICE) { - ctask->exp_r2tsn = 0; - ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE; + tcp_ctask->xmstate = XMSTATE_W_HDR; + tcp_ctask->exp_r2tsn = 0; BUG_ON(ctask->total_length == 0); + if (sc->use_sg) { struct scatterlist *sg = sc->request_buffer; - iscsi_buf_init_sg(&ctask->sendbuf, - &sg[ctask->sg_count++]); - ctask->sg = sg; - ctask->bad_sg = sg + sc->use_sg; - } else { - iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer, - sc->request_bufflen); - } + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &sg[tcp_ctask->sg_count++]); + tcp_ctask->sg = sg; + tcp_ctask->bad_sg = sg + sc->use_sg; + } else + iscsi_buf_init_iov(&tcp_ctask->sendbuf, + sc->request_buffer, + sc->request_bufflen); - /* - * Write counters: - * - * imm_count bytes to be sent right after - * SCSI PDU Header - * - * unsol_count bytes(as Data-Out) to be sent - * without R2T ack right after - * immediate data - * - * r2t_data_count bytes to be sent via R2T ack's - * - * pad_count bytes to be sent as zero-padding - */ - ctask->imm_count = 0; - ctask->unsol_count = 0; - ctask->unsol_datasn = 0; - ctask->xmstate = XMSTATE_W_HDR; - /* calculate write padding */ - ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); - if (ctask->pad_count) { - ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count; + if (ctask->imm_count) + tcp_ctask->xmstate |= XMSTATE_IMM_DATA; + + tcp_ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1); + if (tcp_ctask->pad_count) { + tcp_ctask->pad_count = ISCSI_PAD_LEN - + tcp_ctask->pad_count; debug_scsi("write padding %d bytes\n", - ctask->pad_count); - ctask->xmstate |= XMSTATE_W_PAD; + tcp_ctask->pad_count); + tcp_ctask->xmstate |= XMSTATE_W_PAD; } - if (session->imm_data_en) { - if (ctask->total_length >= session->first_burst) - ctask->imm_count = min(session->first_burst, - conn->max_xmit_dlength); - else - ctask->imm_count = min(ctask->total_length, - conn->max_xmit_dlength); - hton24(ctask->hdr.dlength, ctask->imm_count); - ctask->xmstate |= XMSTATE_IMM_DATA; - } else - zero_data(ctask->hdr.dlength); - - if (!session->initial_r2t_en) - ctask->unsol_count = min(session->first_burst, - ctask->total_length) - ctask->imm_count; - if (!ctask->unsol_count) - /* No unsolicit Data-Out's */ - ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL; - else - ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT; - ctask->r2t_data_count = ctask->total_length - + if (ctask->unsol_count) + tcp_ctask->xmstate |= XMSTATE_UNS_HDR | + XMSTATE_UNS_INIT; + tcp_ctask->r2t_data_count = ctask->total_length - ctask->imm_count - ctask->unsol_count; debug_scsi("cmd [itt %x total %d imm %d imm_data %d " "r2t_data %d]\n", ctask->itt, ctask->total_length, ctask->imm_count, - ctask->unsol_count, ctask->r2t_data_count); - } else { - ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL; - if (sc->sc_data_direction == DMA_FROM_DEVICE) - ctask->hdr.flags |= ISCSI_FLAG_CMD_READ; - ctask->datasn = 0; - ctask->xmstate = XMSTATE_R_HDR; - zero_data(ctask->hdr.dlength); - } + ctask->unsol_count, tcp_ctask->r2t_data_count); + } else + tcp_ctask->xmstate = XMSTATE_R_HDR; - iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr, + iscsi_buf_init_virt(&tcp_ctask->headbuf, (char*)ctask->hdr, sizeof(struct iscsi_hdr)); - conn->scsicmd_pdus_cnt++; } /** - * iscsi_mtask_xmit - xmit management(immediate) task + * iscsi_tcp_mtask_xmit - xmit management(immediate) task * @conn: iscsi connection * @mtask: task management task * @@ -1687,70 +1378,87 @@ iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress **/ static int -iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) +iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask) { + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n", - conn->id, mtask->xmstate, mtask->itt); + conn->id, tcp_mtask->xmstate, mtask->itt); - if (mtask->xmstate & XMSTATE_IMM_HDR) { - mtask->xmstate &= ~XMSTATE_IMM_HDR; + if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) { + tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR; if (mtask->data_count) - mtask->xmstate |= XMSTATE_IMM_DATA; + tcp_mtask->xmstate |= XMSTATE_IMM_DATA; if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE && conn->stop_stage != STOP_CONN_RECOVER && conn->hdrdgst_en) - iscsi_hdr_digest(conn, &mtask->headbuf, - (u8*)mtask->hdrext); - if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) { - mtask->xmstate |= XMSTATE_IMM_HDR; + iscsi_hdr_digest(conn, &tcp_mtask->headbuf, + (u8*)tcp_mtask->hdrext); + if (iscsi_sendhdr(conn, &tcp_mtask->headbuf, + mtask->data_count)) { + tcp_mtask->xmstate |= XMSTATE_IMM_HDR; if (mtask->data_count) - mtask->xmstate &= ~XMSTATE_IMM_DATA; + tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; return -EAGAIN; } } - if (mtask->xmstate & XMSTATE_IMM_DATA) { + if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) { BUG_ON(!mtask->data_count); - mtask->xmstate &= ~XMSTATE_IMM_DATA; + tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA; /* FIXME: implement. * Virtual buffer could be spreaded across multiple pages... */ do { - if (iscsi_sendpage(conn, &mtask->sendbuf, - &mtask->data_count, &mtask->sent)) { - mtask->xmstate |= XMSTATE_IMM_DATA; + if (iscsi_sendpage(conn, &tcp_mtask->sendbuf, + &mtask->data_count, &tcp_mtask->sent)) { + tcp_mtask->xmstate |= XMSTATE_IMM_DATA; return -EAGAIN; } } while (mtask->data_count); } - BUG_ON(mtask->xmstate != XMSTATE_IDLE); + BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE); + if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { + struct iscsi_session *session = conn->session; + + spin_lock_bh(&session->lock); + list_del(&conn->mtask->running); + __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, + sizeof(void*)); + spin_unlock_bh(&session->lock); + } return 0; } static inline int -handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +handle_xmstate_r_hdr(struct iscsi_conn *conn, + struct iscsi_tcp_cmd_task *tcp_ctask) { - ctask->xmstate &= ~XMSTATE_R_HDR; + tcp_ctask->xmstate &= ~XMSTATE_R_HDR; if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext); - if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) { - BUG_ON(ctask->xmstate != XMSTATE_IDLE); + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, + (u8*)tcp_ctask->hdrext); + if (!iscsi_sendhdr(conn, &tcp_ctask->headbuf, 0)) { + BUG_ON(tcp_ctask->xmstate != XMSTATE_IDLE); return 0; /* wait for Data-In */ } - ctask->xmstate |= XMSTATE_R_HDR; + tcp_ctask->xmstate |= XMSTATE_R_HDR; return -EAGAIN; } static inline int -handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +handle_xmstate_w_hdr(struct iscsi_conn *conn, + struct iscsi_cmd_task *ctask) { - ctask->xmstate &= ~XMSTATE_W_HDR; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + tcp_ctask->xmstate &= ~XMSTATE_W_HDR; if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext); - if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) { - ctask->xmstate |= XMSTATE_W_HDR; + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, + (u8*)tcp_ctask->hdrext); + if (iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count)) { + tcp_ctask->xmstate |= XMSTATE_W_HDR; return -EAGAIN; } return 0; @@ -1760,13 +1468,15 @@ static inline int handle_xmstate_data_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - ctask->xmstate &= ~XMSTATE_DATA_DIGEST; - debug_tcp("resent data digest 0x%x\n", ctask->datadigest); - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->datadigest, 0)) { - ctask->xmstate |= XMSTATE_DATA_DIGEST; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + tcp_ctask->xmstate &= ~XMSTATE_DATA_DIGEST; + debug_tcp("resent data digest 0x%x\n", tcp_ctask->datadigest); + if (iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, + &tcp_ctask->datadigest, 0)) { + tcp_ctask->xmstate |= XMSTATE_DATA_DIGEST; debug_tcp("resent data digest 0x%x fail!\n", - ctask->datadigest); + tcp_ctask->datadigest); return -EAGAIN; } return 0; @@ -1775,44 +1485,47 @@ handle_xmstate_data_digest(struct iscsi_conn *conn, static inline int handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + BUG_ON(!ctask->imm_count); - ctask->xmstate &= ~XMSTATE_IMM_DATA; + tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA; if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); - ctask->immdigest = 0; + iscsi_data_digest_init(tcp_conn, ctask); + tcp_ctask->immdigest = 0; } for (;;) { - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count, - &ctask->sent)) { - ctask->xmstate |= XMSTATE_IMM_DATA; + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, &ctask->imm_count, + &tcp_ctask->sent)) { + tcp_ctask->xmstate |= XMSTATE_IMM_DATA; if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, - (u8*)&ctask->immdigest); + crypto_digest_final(tcp_conn->data_tx_tfm, + (u8*)&tcp_ctask->immdigest); debug_tcp("tx imm sendpage fail 0x%x\n", - ctask->datadigest); + tcp_ctask->datadigest); } return -EAGAIN; } if (conn->datadgst_en) - crypto_digest_update(conn->data_tx_tfm, - &ctask->sendbuf.sg, 1); + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); if (!ctask->imm_count) break; - iscsi_buf_init_sg(&ctask->sendbuf, - &ctask->sg[ctask->sg_count++]); + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &tcp_ctask->sg[tcp_ctask->sg_count++]); } - if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) { - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->immdigest, 1)) { + if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { + if (iscsi_digest_final_send(conn, ctask, &tcp_ctask->immbuf, + &tcp_ctask->immdigest, 1)) { debug_tcp("sending imm digest 0x%x fail!\n", - ctask->immdigest); + tcp_ctask->immdigest); return -EAGAIN; } - debug_tcp("sending imm digest 0x%x\n", ctask->immdigest); + debug_tcp("sending imm digest 0x%x\n", tcp_ctask->immdigest); } return 0; @@ -1821,52 +1534,55 @@ handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) static inline int handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_data_task *dtask; - ctask->xmstate |= XMSTATE_UNS_DATA; - if (ctask->xmstate & XMSTATE_UNS_INIT) { + tcp_ctask->xmstate |= XMSTATE_UNS_DATA; + if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) { iscsi_unsolicit_data_init(conn, ctask); - BUG_ON(!ctask->dtask); - dtask = ctask->dtask; + BUG_ON(!tcp_ctask->dtask); + dtask = tcp_ctask->dtask; if (conn->hdrdgst_en) - iscsi_hdr_digest(conn, &ctask->headbuf, + iscsi_hdr_digest(conn, &tcp_ctask->headbuf, (u8*)dtask->hdrext); - ctask->xmstate &= ~XMSTATE_UNS_INIT; + tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT; } - if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) { - ctask->xmstate &= ~XMSTATE_UNS_DATA; - ctask->xmstate |= XMSTATE_UNS_HDR; + if (iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count)) { + tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; + tcp_ctask->xmstate |= XMSTATE_UNS_HDR; return -EAGAIN; } debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n", - ctask->itt, ctask->unsol_count, ctask->sent); + ctask->itt, ctask->unsol_count, tcp_ctask->sent); return 0; } static inline int handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct iscsi_data_task *dtask = ctask->dtask; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_data_task *dtask = tcp_ctask->dtask; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; BUG_ON(!ctask->data_count); - ctask->xmstate &= ~XMSTATE_UNS_DATA; + tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA; if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); + iscsi_data_digest_init(tcp_conn, ctask); dtask->digest = 0; } for (;;) { - int start = ctask->sent; + int start = tcp_ctask->sent; - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count, - &ctask->sent)) { - ctask->unsol_count -= ctask->sent - start; - ctask->xmstate |= XMSTATE_UNS_DATA; + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, + &ctask->data_count, &tcp_ctask->sent)) { + ctask->unsol_count -= tcp_ctask->sent - start; + tcp_ctask->xmstate |= XMSTATE_UNS_DATA; /* will continue with this ctask later.. */ if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, + crypto_digest_final(tcp_conn->data_tx_tfm, (u8 *)&dtask->digest); debug_tcp("tx uns data fail 0x%x\n", dtask->digest); @@ -1874,21 +1590,21 @@ handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) return -EAGAIN; } - BUG_ON(ctask->sent > ctask->total_length); - ctask->unsol_count -= ctask->sent - start; + BUG_ON(tcp_ctask->sent > ctask->total_length); + ctask->unsol_count -= tcp_ctask->sent - start; /* * XXX:we may run here with un-initial sendbuf. * so pass it */ - if (conn->datadgst_en && ctask->sent - start > 0) - crypto_digest_update(conn->data_tx_tfm, - &ctask->sendbuf.sg, 1); + if (conn->datadgst_en && tcp_ctask->sent - start > 0) + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); if (!ctask->data_count) break; - iscsi_buf_init_sg(&ctask->sendbuf, - &ctask->sg[ctask->sg_count++]); + iscsi_buf_init_sg(&tcp_ctask->sendbuf, + &tcp_ctask->sg[tcp_ctask->sg_count++]); } BUG_ON(ctask->unsol_count < 0); @@ -1908,11 +1624,11 @@ handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) debug_tcp("sending uns digest 0x%x, more uns\n", dtask->digest); } - ctask->xmstate |= XMSTATE_UNS_INIT; + tcp_ctask->xmstate |= XMSTATE_UNS_INIT; return 1; } - if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) { + if (conn->datadgst_en && !(tcp_ctask->xmstate & XMSTATE_W_PAD)) { if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1)) { @@ -1930,15 +1646,17 @@ static inline int handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { struct iscsi_session *session = conn->session; - struct iscsi_r2t_info *r2t = ctask->r2t; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_r2t_info *r2t = tcp_ctask->r2t; struct iscsi_data_task *dtask = r2t->dtask; int left; - ctask->xmstate &= ~XMSTATE_SOL_DATA; - ctask->dtask = dtask; + tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; + tcp_ctask->dtask = dtask; if (conn->datadgst_en) { - iscsi_data_digest_init(conn, ctask); + iscsi_data_digest_init(tcp_conn, ctask); dtask->digest = 0; } solicit_again: @@ -1949,10 +1667,10 @@ solicit_again: goto data_out_done; if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) { - ctask->xmstate |= XMSTATE_SOL_DATA; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; /* will continue with this ctask later.. */ if (conn->datadgst_en) { - crypto_digest_final(conn->data_tx_tfm, + crypto_digest_final(tcp_conn->data_tx_tfm, (u8 *)&dtask->digest); debug_tcp("r2t data send fail 0x%x\n", dtask->digest); } @@ -1961,12 +1679,13 @@ solicit_again: BUG_ON(r2t->data_count < 0); if (conn->datadgst_en) - crypto_digest_update(conn->data_tx_tfm, &r2t->sendbuf.sg, 1); + crypto_digest_update(tcp_conn->data_tx_tfm, &r2t->sendbuf.sg, + 1); if (r2t->data_count) { BUG_ON(ctask->sc->use_sg == 0); if (!iscsi_buf_left(&r2t->sendbuf)) { - BUG_ON(ctask->bad_sg == r2t->sg); + BUG_ON(tcp_ctask->bad_sg == r2t->sg); iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg); r2t->sg += 1; } @@ -1993,8 +1712,8 @@ data_out_done: dtask->digest); } iscsi_solicit_data_cont(conn, ctask, r2t, left); - ctask->xmstate |= XMSTATE_SOL_DATA; - ctask->xmstate &= ~XMSTATE_SOL_HDR; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; return 1; } @@ -2002,7 +1721,7 @@ data_out_done: * Done with this R2T. Check if there are more * outstanding R2Ts ready to be processed. */ - BUG_ON(ctask->r2t_data_count - r2t->data_length < 0); + BUG_ON(tcp_ctask->r2t_data_count - r2t->data_length < 0); if (conn->datadgst_en) { if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, &dtask->digest, 1)) { @@ -2013,15 +1732,15 @@ data_out_done: debug_tcp("r2t done dout digest 0x%x\n", dtask->digest); } - ctask->r2t_data_count -= r2t->data_length; - ctask->r2t = NULL; + tcp_ctask->r2t_data_count -= r2t->data_length; + tcp_ctask->r2t = NULL; spin_lock_bh(&session->lock); - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); + __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); spin_unlock_bh(&session->lock); - if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { - ctask->r2t = r2t; - ctask->xmstate |= XMSTATE_SOL_DATA; - ctask->xmstate &= ~XMSTATE_SOL_HDR; + if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) { + tcp_ctask->r2t = r2t; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; return 1; } @@ -2031,29 +1750,34 @@ data_out_done: static inline int handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { - struct iscsi_data_task *dtask = ctask->dtask; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + struct iscsi_data_task *dtask = tcp_ctask->dtask; int sent; - ctask->xmstate &= ~XMSTATE_W_PAD; - iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad, - ctask->pad_count); - if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) { - ctask->xmstate |= XMSTATE_W_PAD; + tcp_ctask->xmstate &= ~XMSTATE_W_PAD; + iscsi_buf_init_virt(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad, + tcp_ctask->pad_count); + if (iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count, + &sent)) { + tcp_ctask->xmstate |= XMSTATE_W_PAD; return -EAGAIN; } if (conn->datadgst_en) { - crypto_digest_update(conn->data_tx_tfm, &ctask->sendbuf.sg, 1); + crypto_digest_update(tcp_conn->data_tx_tfm, + &tcp_ctask->sendbuf.sg, 1); /* imm data? */ if (!dtask) { - if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf, - &ctask->immdigest, 1)) { + if (iscsi_digest_final_send(conn, ctask, + &tcp_ctask->immbuf, + &tcp_ctask->immdigest, 1)) { debug_tcp("send padding digest 0x%x" - "fail!\n", ctask->immdigest); + "fail!\n", tcp_ctask->immdigest); return -EAGAIN; } debug_tcp("done with padding, digest 0x%x\n", - ctask->datadigest); + tcp_ctask->datadigest); } else { if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf, @@ -2071,12 +1795,13 @@ handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) } static int -iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) +iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; int rc = 0; debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n", - conn->id, ctask->xmstate, ctask->itt); + conn->id, tcp_ctask->xmstate, ctask->itt); /* * serialize with TMF AbortTask @@ -2084,40 +1809,40 @@ iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) if (ctask->mtask) return rc; - if (ctask->xmstate & XMSTATE_R_HDR) { - rc = handle_xmstate_r_hdr(conn, ctask); + if (tcp_ctask->xmstate & XMSTATE_R_HDR) { + rc = handle_xmstate_r_hdr(conn, tcp_ctask); return rc; } - if (ctask->xmstate & XMSTATE_W_HDR) { + if (tcp_ctask->xmstate & XMSTATE_W_HDR) { rc = handle_xmstate_w_hdr(conn, ctask); if (rc) return rc; } /* XXX: for data digest xmit recover */ - if (ctask->xmstate & XMSTATE_DATA_DIGEST) { + if (tcp_ctask->xmstate & XMSTATE_DATA_DIGEST) { rc = handle_xmstate_data_digest(conn, ctask); if (rc) return rc; } - if (ctask->xmstate & XMSTATE_IMM_DATA) { + if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) { rc = handle_xmstate_imm_data(conn, ctask); if (rc) return rc; } - if (ctask->xmstate & XMSTATE_UNS_HDR) { + if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) { BUG_ON(!ctask->unsol_count); - ctask->xmstate &= ~XMSTATE_UNS_HDR; + tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR; unsolicit_head_again: rc = handle_xmstate_uns_hdr(conn, ctask); if (rc) return rc; } - if (ctask->xmstate & XMSTATE_UNS_DATA) { + if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) { rc = handle_xmstate_uns_data(conn, ctask); if (rc == 1) goto unsolicit_head_again; @@ -2126,22 +1851,22 @@ unsolicit_head_again: goto done; } - if (ctask->xmstate & XMSTATE_SOL_HDR) { + if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) { struct iscsi_r2t_info *r2t; - ctask->xmstate &= ~XMSTATE_SOL_HDR; - ctask->xmstate |= XMSTATE_SOL_DATA; - if (!ctask->r2t) - __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t, + tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR; + tcp_ctask->xmstate |= XMSTATE_SOL_DATA; + if (!tcp_ctask->r2t) + __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t, sizeof(void*)); solicit_head_again: - r2t = ctask->r2t; + r2t = tcp_ctask->r2t; if (conn->hdrdgst_en) iscsi_hdr_digest(conn, &r2t->headbuf, (u8*)r2t->dtask->hdrext); if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) { - ctask->xmstate &= ~XMSTATE_SOL_DATA; - ctask->xmstate |= XMSTATE_SOL_HDR; + tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA; + tcp_ctask->xmstate |= XMSTATE_SOL_HDR; return -EAGAIN; } @@ -2150,7 +1875,7 @@ solicit_head_again: r2t->sent); } - if (ctask->xmstate & XMSTATE_SOL_DATA) { + if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) { rc = handle_xmstate_sol_data(conn, ctask); if (rc == 1) goto solicit_head_again; @@ -2163,492 +1888,98 @@ done: * Last thing to check is whether we need to send write * padding. Note that we check for xmstate equality, not just the bit. */ - if (ctask->xmstate == XMSTATE_W_PAD) + if (tcp_ctask->xmstate == XMSTATE_W_PAD) rc = handle_xmstate_w_pad(conn, ctask); return rc; } -/** - * iscsi_data_xmit - xmit any command into the scheduled connection - * @conn: iscsi connection - * - * Notes: - * The function can return -EAGAIN in which case the caller must - * re-schedule it again later or recover. '0' return code means - * successful xmit. - **/ -static int -iscsi_data_xmit(struct iscsi_conn *conn) -{ - if (unlikely(conn->suspend_tx)) { - debug_tcp("conn %d Tx suspended!\n", conn->id); - return 0; - } - - /* - * Transmit in the following order: - * - * 1) un-finished xmit (ctask or mtask) - * 2) immediate control PDUs - * 3) write data - * 4) SCSI commands - * 5) non-immediate control PDUs - * - * No need to lock around __kfifo_get as long as - * there's one producer and one consumer. - */ - - BUG_ON(conn->ctask && conn->mtask); - - if (conn->ctask) { - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - /* done with this in-progress ctask */ - conn->ctask = NULL; - } - if (conn->mtask) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - /* done with this in-progress mtask */ - conn->mtask = NULL; - } - - /* process immediate first */ - if (unlikely(__kfifo_len(conn->immqueue))) { - struct iscsi_session *session = conn->session; - while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, - sizeof(void*))) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - - if (conn->mtask->hdr.itt == - cpu_to_be32(ISCSI_RESERVED_TAG)) { - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&conn->mtask, sizeof(void*)); - spin_unlock_bh(&session->lock); - } - } - /* done with this mtask */ - conn->mtask = NULL; - } - - /* process write queue */ - while (__kfifo_get(conn->writequeue, (void*)&conn->ctask, - sizeof(void*))) { - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - } - - /* process command queue */ - while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask, - sizeof(void*))) { - list_add_tail(&conn->ctask->running, &conn->run_list); - if (iscsi_ctask_xmit(conn, conn->ctask)) - goto again; - } - /* done with this ctask */ - conn->ctask = NULL; - - /* process the rest control plane PDUs, if any */ - if (unlikely(__kfifo_len(conn->mgmtqueue))) { - struct iscsi_session *session = conn->session; - - while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, - sizeof(void*))) { - if (iscsi_mtask_xmit(conn, conn->mtask)) - goto again; - - if (conn->mtask->hdr.itt == - cpu_to_be32(ISCSI_RESERVED_TAG)) { - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, - (void*)&conn->mtask, - sizeof(void*)); - spin_unlock_bh(&session->lock); - } - } - /* done with this mtask */ - conn->mtask = NULL; - } - - return 0; - -again: - if (unlikely(conn->suspend_tx)) - return 0; - - return -EAGAIN; -} - -static void -iscsi_xmitworker(void *data) -{ - struct iscsi_conn *conn = data; - - /* - * serialize Xmit worker on a per-connection basis. - */ - mutex_lock(&conn->xmitmutex); - if (iscsi_data_xmit(conn)) - scsi_queue_work(conn->session->host, &conn->xmitwork); - mutex_unlock(&conn->xmitmutex); -} - -enum { - FAILURE_BAD_HOST = 1, - FAILURE_SESSION_FAILED, - FAILURE_SESSION_FREED, - FAILURE_WINDOW_CLOSED, - FAILURE_SESSION_TERMINATE, - FAILURE_SESSION_RECOVERY_TIMEOUT, -}; - -static int -iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) -{ - struct Scsi_Host *host; - int reason = 0; - struct iscsi_session *session; - struct iscsi_conn *conn = NULL; - struct iscsi_cmd_task *ctask = NULL; - - sc->scsi_done = done; - sc->result = 0; - - host = sc->device->host; - session = iscsi_hostdata(host->hostdata); - - spin_lock(&session->lock); - - if (session->state != ISCSI_STATE_LOGGED_IN) { - if (session->recovery_failed) { - reason = FAILURE_SESSION_RECOVERY_TIMEOUT; - goto fault; - } else if (session->state == ISCSI_STATE_FAILED) { - reason = FAILURE_SESSION_FAILED; - goto reject; - } else if (session->state == ISCSI_STATE_TERMINATE) { - reason = FAILURE_SESSION_TERMINATE; - goto fault; - } - reason = FAILURE_SESSION_FREED; - goto fault; - } - - /* - * Check for iSCSI window and take care of CmdSN wrap-around - */ - if ((int)(session->max_cmdsn - session->cmdsn) < 0) { - reason = FAILURE_WINDOW_CLOSED; - goto reject; - } - - conn = session->leadconn; - - __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); - BUG_ON(ctask->sc); - - sc->SCp.phase = session->age; - sc->SCp.ptr = (char*)ctask; - iscsi_cmd_init(conn, ctask, sc); - - __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); - debug_scsi( - "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", - sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", - conn->id, (long)sc, ctask->itt, sc->request_bufflen, - session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); - spin_unlock(&session->lock); - - scsi_queue_work(host, &conn->xmitwork); - return 0; - -reject: - spin_unlock(&session->lock); - debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); - return SCSI_MLQUEUE_HOST_BUSY; - -fault: - spin_unlock(&session->lock); - printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n", - sc->cmnd[0], reason); - sc->result = (DID_NO_CONNECT << 16); - sc->resid = sc->request_bufflen; - sc->scsi_done(sc); - return 0; -} - -static int -iscsi_change_queue_depth(struct scsi_device *sdev, int depth) -{ - if (depth > ISCSI_MAX_CMD_PER_LUN) - depth = ISCSI_MAX_CMD_PER_LUN; - scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); - return sdev->queue_depth; -} - -static int -iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) -{ - int i; - - *items = kmalloc(max * sizeof(void*), GFP_KERNEL); - if (*items == NULL) - return -ENOMEM; - - q->max = max; - q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); - if (q->pool == NULL) { - kfree(*items); - return -ENOMEM; - } - - q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), - GFP_KERNEL, NULL); - if (q->queue == ERR_PTR(-ENOMEM)) { - kfree(q->pool); - kfree(*items); - return -ENOMEM; - } - - for (i = 0; i < max; i++) { - q->pool[i] = kmalloc(item_size, GFP_KERNEL); - if (q->pool[i] == NULL) { - int j; - - for (j = 0; j < i; j++) - kfree(q->pool[j]); - - kfifo_free(q->queue); - kfree(q->pool); - kfree(*items); - return -ENOMEM; - } - memset(q->pool[i], 0, item_size); - (*items)[i] = q->pool[i]; - __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); - } - return 0; -} - -static void -iscsi_pool_free(struct iscsi_queue *q, void **items) -{ - int i; - - for (i = 0; i < q->max; i++) - kfree(items[i]); - kfree(q->pool); - kfree(items); -} - static struct iscsi_cls_conn * -iscsi_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) +iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) { - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); struct iscsi_conn *conn; struct iscsi_cls_conn *cls_conn; + struct iscsi_tcp_conn *tcp_conn; - cls_conn = iscsi_create_conn(cls_session, conn_idx); + cls_conn = iscsi_conn_setup(cls_session, conn_idx); if (!cls_conn) return NULL; conn = cls_conn->dd_data; - memset(conn, 0, sizeof(*conn)); - - conn->cls_conn = cls_conn; - conn->c_stage = ISCSI_CONN_INITIAL_STAGE; - conn->in_progress = IN_PROGRESS_WAIT_HEADER; - conn->id = conn_idx; - conn->exp_statsn = 0; - conn->tmabort_state = TMABORT_INITIAL; - INIT_LIST_HEAD(&conn->run_list); - - /* initial operational parameters */ - conn->hdr_size = sizeof(struct iscsi_hdr); - conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; + /* + * due to strange issues with iser these are not set + * in iscsi_conn_setup + */ conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; - /* initialize general xmit PDU commands queue */ - conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->xmitqueue == ERR_PTR(-ENOMEM)) - goto xmitqueue_alloc_fail; + tcp_conn = kzalloc(sizeof(*tcp_conn), GFP_KERNEL); + if (!tcp_conn) + goto tcp_conn_alloc_fail; - /* initialize write response PDU commands queue */ - conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->writequeue == ERR_PTR(-ENOMEM)) - goto writequeue_alloc_fail; - - /* initialize general immediate & non-immediate PDU commands queue */ - conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->immqueue == ERR_PTR(-ENOMEM)) - goto immqueue_alloc_fail; - - conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), - GFP_KERNEL, NULL); - if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) - goto mgmtqueue_alloc_fail; - - INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); - - /* allocate login_mtask used for the login/text sequences */ - spin_lock_bh(&session->lock); - if (!__kfifo_get(session->mgmtpool.queue, - (void*)&conn->login_mtask, - sizeof(void*))) { - spin_unlock_bh(&session->lock); - goto login_mtask_alloc_fail; - } - spin_unlock_bh(&session->lock); + conn->dd_data = tcp_conn; + tcp_conn->iscsi_conn = conn; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; + /* initial operational parameters */ + tcp_conn->hdr_size = sizeof(struct iscsi_hdr); + tcp_conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH; /* allocate initial PDU receive place holder */ - if (conn->data_size <= PAGE_SIZE) - conn->data = kmalloc(conn->data_size, GFP_KERNEL); + if (tcp_conn->data_size <= PAGE_SIZE) + tcp_conn->data = kmalloc(tcp_conn->data_size, GFP_KERNEL); else - conn->data = (void*)__get_free_pages(GFP_KERNEL, - get_order(conn->data_size)); - if (!conn->data) + tcp_conn->data = (void*)__get_free_pages(GFP_KERNEL, + get_order(tcp_conn->data_size)); + if (!tcp_conn->data) goto max_recv_dlenght_alloc_fail; - init_timer(&conn->tmabort_timer); - mutex_init(&conn->xmitmutex); - init_waitqueue_head(&conn->ehwait); - return cls_conn; max_recv_dlenght_alloc_fail: - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, - sizeof(void*)); - spin_unlock_bh(&session->lock); -login_mtask_alloc_fail: - kfifo_free(conn->mgmtqueue); -mgmtqueue_alloc_fail: - kfifo_free(conn->immqueue); -immqueue_alloc_fail: - kfifo_free(conn->writequeue); -writequeue_alloc_fail: - kfifo_free(conn->xmitqueue); -xmitqueue_alloc_fail: - iscsi_destroy_conn(cls_conn); + kfree(tcp_conn); +tcp_conn_alloc_fail: + iscsi_conn_teardown(cls_conn); return NULL; } static void -iscsi_conn_destroy(struct iscsi_cls_conn *cls_conn) +iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) { struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - unsigned long flags; - - mutex_lock(&conn->xmitmutex); - set_bit(SUSPEND_BIT, &conn->suspend_tx); - if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) { - struct sock *sk = conn->sock->sk; - - /* - * conn_start() has never been called! - * need to cleanup the socket. - */ - write_lock_bh(&sk->sk_callback_lock); - set_bit(SUSPEND_BIT, &conn->suspend_rx); - write_unlock_bh(&sk->sk_callback_lock); - - sock_hold(conn->sock->sk); - iscsi_conn_restore_callbacks(conn); - sock_put(conn->sock->sk); - sock_release(conn->sock); - conn->sock = NULL; - } - - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; - if (session->leadconn == conn) { - /* - * leading connection? then give up on recovery. - */ - session->state = ISCSI_STATE_TERMINATE; - wake_up(&conn->ehwait); - } - spin_unlock_bh(&session->lock); + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; + int digest = 0; - mutex_unlock(&conn->xmitmutex); + if (conn->hdrdgst_en || conn->datadgst_en) + digest = 1; - /* - * Block until all in-progress commands for this connection - * time out or fail. - */ - for (;;) { - spin_lock_irqsave(session->host->host_lock, flags); - if (!session->host->host_busy) { /* OK for ERL == 0 */ - spin_unlock_irqrestore(session->host->host_lock, flags); - break; - } - spin_unlock_irqrestore(session->host->host_lock, flags); - msleep_interruptible(500); - printk("conn_destroy(): host_busy %d host_failed %d\n", - session->host->host_busy, session->host->host_failed); - /* - * force eh_abort() to unblock - */ - wake_up(&conn->ehwait); - } + iscsi_conn_teardown(cls_conn); - /* now free crypto */ - if (conn->hdrdgst_en || conn->datadgst_en) { - if (conn->tx_tfm) - crypto_free_tfm(conn->tx_tfm); - if (conn->rx_tfm) - crypto_free_tfm(conn->rx_tfm); - if (conn->data_tx_tfm) - crypto_free_tfm(conn->data_tx_tfm); - if (conn->data_rx_tfm) - crypto_free_tfm(conn->data_rx_tfm); + /* now free tcp_conn */ + if (digest) { + if (tcp_conn->tx_tfm) + crypto_free_tfm(tcp_conn->tx_tfm); + if (tcp_conn->rx_tfm) + crypto_free_tfm(tcp_conn->rx_tfm); + if (tcp_conn->data_tx_tfm) + crypto_free_tfm(tcp_conn->data_tx_tfm); + if (tcp_conn->data_rx_tfm) + crypto_free_tfm(tcp_conn->data_rx_tfm); } /* free conn->data, size = MaxRecvDataSegmentLength */ - if (conn->data_size <= PAGE_SIZE) - kfree(conn->data); + if (tcp_conn->data_size <= PAGE_SIZE) + kfree(tcp_conn->data); else - free_pages((unsigned long)conn->data, - get_order(conn->data_size)); - - spin_lock_bh(&session->lock); - __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, - sizeof(void*)); - list_del(&conn->item); - if (list_empty(&session->connections)) - session->leadconn = NULL; - if (session->leadconn && session->leadconn == conn) - session->leadconn = container_of(session->connections.next, - struct iscsi_conn, item); - - if (session->leadconn == NULL) - /* none connections exits.. reset sequencing */ - session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; - spin_unlock_bh(&session->lock); - - kfifo_free(conn->xmitqueue); - kfifo_free(conn->writequeue); - kfifo_free(conn->immqueue); - kfifo_free(conn->mgmtqueue); - - iscsi_destroy_conn(cls_conn); + free_pages((unsigned long)tcp_conn->data, + get_order(tcp_conn->data_size)); + kfree(tcp_conn); } static int -iscsi_conn_bind(struct iscsi_cls_session *cls_session, - struct iscsi_cls_conn *cls_conn, uint32_t transport_fd, - int is_leading) +iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session, + struct iscsi_cls_conn *cls_conn, uint32_t transport_fd, + int is_leading) { - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data; + struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct sock *sk; struct socket *sock; int err; @@ -2660,32 +1991,13 @@ iscsi_conn_bind(struct iscsi_cls_session *cls_session, return -EEXIST; } - /* lookup for existing connection */ - spin_lock_bh(&session->lock); - list_for_each_entry(tmp, &session->connections, item) { - if (tmp == conn) { - if (conn->c_stage != ISCSI_CONN_STOPPED || - conn->stop_stage == STOP_CONN_TERM) { - printk(KERN_ERR "iscsi_tcp: can't bind " - "non-stopped connection (%d:%d)\n", - conn->c_stage, conn->stop_stage); - spin_unlock_bh(&session->lock); - return -EIO; - } - break; - } - } - if (tmp != conn) { - /* bind new iSCSI connection to session */ - conn->session = session; - - list_add(&conn->item, &session->connections); - } - spin_unlock_bh(&session->lock); + err = iscsi_conn_bind(cls_session, cls_conn, is_leading); + if (err) + return err; if (conn->stop_stage != STOP_CONN_SUSPEND) { /* bind iSCSI connection and socket */ - conn->sock = sock; + tcp_conn->sock = sock; /* setup Socket parameters */ sk = sock->sk; @@ -2699,608 +2011,78 @@ iscsi_conn_bind(struct iscsi_cls_session *cls_session, * Intercept TCP callbacks for sendfile like receive * processing. */ + conn->recv_lock = &sk->sk_callback_lock; iscsi_conn_set_callbacks(conn); - - conn->sendpage = conn->sock->ops->sendpage; - + tcp_conn->sendpage = tcp_conn->sock->ops->sendpage; /* * set receive state machine into initial state */ - conn->in_progress = IN_PROGRESS_WAIT_HEADER; + tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER; } - if (is_leading) - session->leadconn = conn; - - /* - * Unblock xmitworker(), Login Phase will pass through. - */ - clear_bit(SUSPEND_BIT, &conn->suspend_rx); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); - - return 0; -} - -static void -iscsi_session_recovery_timedout(struct iscsi_cls_session *csession) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(csession); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - struct iscsi_conn *conn = session->leadconn; - - spin_lock_bh(&session->lock); - if (session->state != ISCSI_STATE_LOGGED_IN) { - session->recovery_failed = 1; - if (conn) - wake_up(&conn->ehwait); - } - spin_unlock_bh(&session->lock); -} - -static int -iscsi_conn_start(struct iscsi_cls_conn *cls_conn) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - struct sock *sk; - - /* FF phase warming up... */ - - if (session == NULL) { - printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n"); - return -EPERM; - } - - sk = conn->sock->sk; - write_lock_bh(&sk->sk_callback_lock); - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_STARTED; - session->state = ISCSI_STATE_LOGGED_IN; - - switch(conn->stop_stage) { - case STOP_CONN_RECOVER: - /* - * unblock eh_abort() if it is blocked. re-try all - * commands after successful recovery - */ - session->conn_cnt++; - conn->stop_stage = 0; - conn->tmabort_state = TMABORT_INITIAL; - session->age++; - session->recovery_failed = 0; - spin_unlock_bh(&session->lock); - write_unlock_bh(&sk->sk_callback_lock); - - iscsi_unblock_session(session_to_cls(session)); - wake_up(&conn->ehwait); - return 0; - case STOP_CONN_TERM: - session->conn_cnt++; - conn->stop_stage = 0; - break; - case STOP_CONN_SUSPEND: - conn->stop_stage = 0; - clear_bit(SUSPEND_BIT, &conn->suspend_rx); - clear_bit(SUSPEND_BIT, &conn->suspend_tx); - break; - default: - break; - } - spin_unlock_bh(&session->lock); - write_unlock_bh(&sk->sk_callback_lock); - - return 0; -} - -static int -iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) -{ - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - struct iscsi_mgmt_task *mtask; - - if (!ctask->mtask) - return -EINVAL; - - while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*))) { - if (mtask == ctask->mtask) - break; - __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); - } - - __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, - sizeof(void*)); - ctask->mtask = NULL; return 0; } static void -fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, int err) +iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) { + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; struct iscsi_r2t_info *r2t; - struct scsi_cmnd *sc; /* flush ctask's r2t queues */ - while (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) - __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); - - iscsi_ctask_mtask_cleanup(ctask); - - sc = ctask->sc; - if (!sc) - return; - - sc->result = err; - sc->resid = sc->request_bufflen; - - __iscsi_ctask_cleanup(conn, ctask); -} - -/* Fail commands. Mutex and session lock held */ -static void -fail_all_commands(struct iscsi_session *session, struct iscsi_conn *conn) -{ - struct iscsi_cmd_task *ctask, *tmp; - - /* flush pending */ - while (__kfifo_get(conn->xmitqueue, (void*)&ctask, sizeof(void*))) { - debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, - ctask->itt); - fail_command(conn, ctask, DID_BUS_BUSY << 16); - } - - /* fail running */ - list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { - debug_scsi("failing in progress sc %p itt 0x%x\n", - ctask->sc, ctask->itt); - fail_command(conn, ctask, DID_BUS_BUSY << 16); - } - - conn->ctask = NULL; -} - -static void -flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) -{ - struct iscsi_mgmt_task *mtask; - - /* TODO: handle running pdus */ - while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || - __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { - if (mtask == conn->login_mtask) - continue; - __kfifo_put(session->mgmtpool.queue, (void*)&mtask, + while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) + __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t, sizeof(void*)); - } - if (conn->mtask && conn->mtask != conn->login_mtask) - __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, - sizeof(void*)); - conn->mtask = NULL; + __iscsi_ctask_cleanup(conn, ctask); } static void -iscsi_suspend_conn_rx(struct iscsi_conn *conn) +iscsi_tcp_suspend_conn_rx(struct iscsi_conn *conn) { + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct sock *sk; - BUG_ON(!conn->sock); - sk = conn->sock->sk; + if (!tcp_conn->sock) + return; + + sk = tcp_conn->sock->sk; write_lock_bh(&sk->sk_callback_lock); - set_bit(SUSPEND_BIT, &conn->suspend_rx); + set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); write_unlock_bh(&sk->sk_callback_lock); } static void -iscsi_start_session_recovery(struct iscsi_session *session, - struct iscsi_conn *conn, int flag) +iscsi_tcp_terminate_conn(struct iscsi_conn *conn) { - spin_lock_bh(&session->lock); - if (conn->stop_stage == STOP_CONN_RECOVER || - conn->stop_stage == STOP_CONN_TERM) { - spin_unlock_bh(&session->lock); - return; - } - conn->stop_stage = flag; - spin_unlock_bh(&session->lock); - - iscsi_suspend_conn_rx(conn); + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(SUSPEND_BIT, &conn->suspend_tx); - - session->conn_cnt--; - if (session->conn_cnt == 0 || session->leadconn == conn) - session->state = ISCSI_STATE_FAILED; - - spin_unlock_bh(&session->lock); + if (!tcp_conn->sock) + return; - /* - * Socket must go now. - */ - sock_hold(conn->sock->sk); + sock_hold(tcp_conn->sock->sk); iscsi_conn_restore_callbacks(conn); - sock_put(conn->sock->sk); - - /* - * flush queues. - */ - spin_lock_bh(&session->lock); - fail_all_commands(session, conn); - flush_control_queues(session, conn); - spin_unlock_bh(&session->lock); - - /* - * release socket only after we stopped data_xmit() - * activity and flushed all outstandings - */ - sock_release(conn->sock); - conn->sock = NULL; - - /* - * for connection level recovery we should not calculate - * header digest. conn->hdr_size used for optimization - * in hdr_extract() and will be re-negotiated at - * set_param() time. - */ - if (flag == STOP_CONN_RECOVER) { - conn->hdr_size = sizeof(struct iscsi_hdr); - conn->hdrdgst_en = 0; - conn->datadgst_en = 0; + sock_put(tcp_conn->sock->sk); - if (session->state == ISCSI_STATE_FAILED) - iscsi_block_session(session_to_cls(session)); - } - mutex_unlock(&conn->xmitmutex); + sock_release(tcp_conn->sock); + tcp_conn->sock = NULL; + conn->recv_lock = NULL; } +/* called with host lock */ static void -iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) -{ - struct iscsi_conn *conn = cls_conn->dd_data; - struct iscsi_session *session = conn->session; - - switch (flag) { - case STOP_CONN_RECOVER: - case STOP_CONN_TERM: - iscsi_start_session_recovery(session, conn, flag); - return; - case STOP_CONN_SUSPEND: - iscsi_suspend_conn_rx(conn); - - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - - conn->stop_stage = flag; - conn->c_stage = ISCSI_CONN_STOPPED; - set_bit(SUSPEND_BIT, &conn->suspend_tx); - - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - break; - default: - printk(KERN_ERR "invalid stop flag %d\n", flag); - } -} - -static int -iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, - char *data, uint32_t data_size) +iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask, + char *data, uint32_t data_size) { - struct iscsi_session *session = conn->session; - struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; - struct iscsi_mgmt_task *mtask; + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; - spin_lock_bh(&session->lock); - if (session->state == ISCSI_STATE_TERMINATE) { - spin_unlock_bh(&session->lock); - return -EPERM; - } - if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || - hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) - /* - * Login and Text are sent serially, in - * request-followed-by-response sequence. - * Same mtask can be used. Same ITT must be used. - * Note that login_mtask is preallocated at conn_create(). - */ - mtask = conn->login_mtask; - else { - BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); - BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); - - if (!__kfifo_get(session->mgmtpool.queue, - (void*)&mtask, sizeof(void*))) { - spin_unlock_bh(&session->lock); - return -ENOSPC; - } - } - - /* - * pre-format CmdSN and ExpStatSN for outgoing PDU. - */ - if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { - hdr->itt = mtask->itt | (conn->id << CID_SHIFT) | - (session->age << AGE_SHIFT); - nop->cmdsn = cpu_to_be32(session->cmdsn); - if (conn->c_stage == ISCSI_CONN_STARTED && - !(hdr->opcode & ISCSI_OP_IMMEDIATE)) - session->cmdsn++; - } else - /* do not advance CmdSN */ - nop->cmdsn = cpu_to_be32(session->cmdsn); - - nop->exp_statsn = cpu_to_be32(conn->exp_statsn); - - memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr)); - - iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr, + iscsi_buf_init_virt(&tcp_mtask->headbuf, (char*)mtask->hdr, sizeof(struct iscsi_hdr)); + tcp_mtask->xmstate = XMSTATE_IMM_HDR; - spin_unlock_bh(&session->lock); - - if (data_size) { - memcpy(mtask->data, data, data_size); - mtask->data_count = data_size; - } else - mtask->data_count = 0; - - mtask->xmstate = XMSTATE_IMM_HDR; - - if (mtask->data_count) { - iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data, + if (mtask->data_count) + iscsi_buf_init_iov(&tcp_mtask->sendbuf, (char*)mtask->data, mtask->data_count); - } - - debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", - hdr->opcode, hdr->itt, data_size); - - /* - * since send_pdu() could be called at least from two contexts, - * we need to serialize __kfifo_put, so we don't have to take - * additional lock on fast data-path - */ - if (hdr->opcode & ISCSI_OP_IMMEDIATE) - __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); - else - __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); - - scsi_queue_work(session->host, &conn->xmitwork); - return 0; -} - -static int -iscsi_eh_host_reset(struct scsi_cmnd *sc) -{ - struct Scsi_Host *host = sc->device->host; - struct iscsi_session *session = iscsi_hostdata(host->hostdata); - struct iscsi_conn *conn = session->leadconn; - int fail_session = 0; - - spin_lock_bh(&session->lock); - if (session->state == ISCSI_STATE_TERMINATE) { -failed: - debug_scsi("failing host reset: session terminated " - "[CID %d age %d]", conn->id, session->age); - spin_unlock_bh(&session->lock); - return FAILED; - } - - if (sc->SCp.phase == session->age) { - debug_scsi("failing connection CID %d due to SCSI host reset", - conn->id); - fail_session = 1; - } - spin_unlock_bh(&session->lock); - - /* - * we drop the lock here but the leadconn cannot be destoyed while - * we are in the scsi eh - */ - if (fail_session) { - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - /* - * if userspace cannot respond then we must kick this off - * here for it - */ - iscsi_start_session_recovery(session, conn, STOP_CONN_RECOVER); - } - - debug_scsi("iscsi_eh_host_reset wait for relogin\n"); - wait_event_interruptible(conn->ehwait, - session->state == ISCSI_STATE_TERMINATE || - session->state == ISCSI_STATE_LOGGED_IN || - session->recovery_failed); - if (signal_pending(current)) - flush_signals(current); - - spin_lock_bh(&session->lock); - if (session->state == ISCSI_STATE_LOGGED_IN) - printk(KERN_INFO "host reset succeeded\n"); - else - goto failed; - spin_unlock_bh(&session->lock); - - return SUCCESS; -} - -static void -iscsi_tmabort_timedout(unsigned long data) -{ - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - - spin_lock(&session->lock); - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmabort_state = TMABORT_TIMEDOUT; - debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n", - (long)ctask->sc, ctask->itt); - /* unblock eh_abort() */ - wake_up(&conn->ehwait); - } - spin_unlock(&session->lock); -} - -/* must be called with the mutex lock */ -static int -iscsi_exec_abort_task(struct scsi_cmnd *sc, struct iscsi_cmd_task *ctask) -{ - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - struct iscsi_tm *hdr = &conn->tmhdr; - int rc; - - /* - * ctask timed out but session is OK requests must be serialized. - */ - memset(hdr, 0, sizeof(struct iscsi_tm)); - hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; - hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; - hdr->flags |= ISCSI_FLAG_CMD_FINAL; - memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun)); - hdr->rtt = ctask->hdr.itt; - hdr->refcmdsn = ctask->hdr.cmdsn; - - rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, - NULL, 0); - if (rc) { - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc); - return rc; - } - - debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); - - spin_lock_bh(&session->lock); - ctask->mtask = (struct iscsi_mgmt_task *) - session->mgmt_cmds[(hdr->itt & ITT_MASK) - - ISCSI_MGMT_ITT_OFFSET]; - - if (conn->tmabort_state == TMABORT_INITIAL) { - conn->tmfcmd_pdus_cnt++; - conn->tmabort_timer.expires = 10*HZ + jiffies; - conn->tmabort_timer.function = iscsi_tmabort_timedout; - conn->tmabort_timer.data = (unsigned long)ctask; - add_timer(&conn->tmabort_timer); - debug_scsi("abort set timeout [itt 0x%x]", ctask->itt); - } - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - - /* - * block eh thread until: - * - * 1) abort response - * 2) abort timeout - * 3) session is terminated or restarted or userspace has - * given up on recovery - */ - wait_event_interruptible(conn->ehwait, - sc->SCp.phase != session->age || - session->state != ISCSI_STATE_LOGGED_IN || - conn->tmabort_state != TMABORT_INITIAL || - session->recovery_failed); - if (signal_pending(current)) - flush_signals(current); - del_timer_sync(&conn->tmabort_timer); - - mutex_lock(&conn->xmitmutex); - return 0; -} - -static int -iscsi_eh_abort(struct scsi_cmnd *sc) -{ - struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; - struct iscsi_cmd_task *tmp_ctask; - struct iscsi_conn *conn = ctask->conn; - struct iscsi_session *session = conn->session; - int rc; - - conn->eh_abort_cnt++; - debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); - - mutex_lock(&conn->xmitmutex); - spin_lock_bh(&session->lock); - - /* - * If we are not logged in or we have started a new session - * then let the host reset code handle this - */ - if (session->state != ISCSI_STATE_LOGGED_IN || - sc->SCp.phase != session->age) - goto failed; - - /* ctask completed before time out */ - if (!ctask->sc) - goto success; - - /* what should we do here ? */ - if (conn->ctask == ctask) { - printk(KERN_INFO "sc %p itt 0x%x partially sent. Failing " - "abort\n", sc, ctask->itt); - goto failed; - } - - /* check for the easy pending cmd abort */ - while (__kfifo_get(conn->xmitqueue, (void*)&tmp_ctask, sizeof(void*))) { - if (tmp_ctask->itt == ctask->itt) { - debug_scsi("found pending task\n"); - goto success; - } - __kfifo_put(conn->xmitqueue, (void*)&tmp_ctask, sizeof(void*)); - } - - conn->tmabort_state = TMABORT_INITIAL; - - spin_unlock_bh(&session->lock); - rc = iscsi_exec_abort_task(sc, ctask); - spin_lock_bh(&session->lock); - - iscsi_ctask_mtask_cleanup(ctask); - if (rc || sc->SCp.phase != session->age || - session->state != ISCSI_STATE_LOGGED_IN) - goto failed; - - /* ctask completed before tmf abort response */ - if (!ctask->sc) { - debug_scsi("sc completed while abort in progress\n"); - goto success; - } - - if (conn->tmabort_state != TMABORT_SUCCESS) { - spin_unlock_bh(&session->lock); - iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); - spin_lock_bh(&session->lock); - goto failed; - } - -success: - debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - spin_unlock_bh(&session->lock); - - /* clean up task if aborted */ - if (conn->sock) { - struct sock *sk = conn->sock->sk; - - write_lock_bh(&sk->sk_callback_lock); - spin_lock(&session->lock); - fail_command(conn, ctask, DRIVER_TIMEOUT << 24); - spin_unlock(&session->lock); - write_unlock_bh(&sk->sk_callback_lock); - } - mutex_unlock(&conn->xmitmutex); - return SUCCESS; - -failed: - spin_unlock_bh(&session->lock); - mutex_unlock(&conn->xmitmutex); - - debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); - return FAILED; } static int @@ -3314,6 +2096,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session) */ for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; /* * pre-allocated x4 as much r2ts to handle race when @@ -3322,16 +2105,18 @@ iscsi_r2tpool_alloc(struct iscsi_session *session) */ /* R2T pool */ - if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4, - (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) { + if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, + (void***)&tcp_ctask->r2ts, + sizeof(struct iscsi_r2t_info))) { goto r2t_alloc_fail; } /* R2T xmit queue */ - ctask->r2tqueue = kfifo_alloc( + tcp_ctask->r2tqueue = kfifo_alloc( session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL); - if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) { - iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts); + if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) { + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); goto r2t_alloc_fail; } @@ -3340,24 +2125,28 @@ iscsi_r2tpool_alloc(struct iscsi_session *session) * Data-Out PDU's within R2T-sequence can be quite big; * using mempool */ - ctask->datapool = mempool_create_slab_pool(ISCSI_DTASK_DEFAULT_MAX, - taskcache); - if (ctask->datapool == NULL) { - kfifo_free(ctask->r2tqueue); - iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts); + tcp_ctask->datapool = mempool_create_slab_pool(ISCSI_DTASK_DEFAULT_MAX, + taskcache); + if (tcp_ctask->datapool == NULL) { + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); goto r2t_alloc_fail; } - INIT_LIST_HEAD(&ctask->dataqueue); + INIT_LIST_HEAD(&tcp_ctask->dataqueue); } return 0; r2t_alloc_fail: for (i = 0; i < cmd_i; i++) { - mempool_destroy(session->cmds[i]->datapool); - kfifo_free(session->cmds[i]->r2tqueue); - iscsi_pool_free(&session->cmds[i]->r2tpool, - (void**)session->cmds[i]->r2ts); + struct iscsi_cmd_task *ctask = session->cmds[i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + mempool_destroy(tcp_ctask->datapool); + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); } return -ENOMEM; } @@ -3368,128 +2157,14 @@ iscsi_r2tpool_free(struct iscsi_session *session) int i; for (i = 0; i < session->cmds_max; i++) { - mempool_destroy(session->cmds[i]->datapool); - kfifo_free(session->cmds[i]->r2tqueue); - iscsi_pool_free(&session->cmds[i]->r2tpool, - (void**)session->cmds[i]->r2ts); - } -} - -static struct scsi_host_template iscsi_sht = { - .name = "iSCSI Initiator over TCP/IP, v." - ISCSI_VERSION_STR, - .queuecommand = iscsi_queuecommand, - .change_queue_depth = iscsi_change_queue_depth, - .can_queue = ISCSI_XMIT_CMDS_MAX - 1, - .sg_tablesize = ISCSI_SG_TABLESIZE, - .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, - .eh_abort_handler = iscsi_eh_abort, - .eh_host_reset_handler = iscsi_eh_host_reset, - .use_clustering = DISABLE_CLUSTERING, - .proc_name = "iscsi_tcp", - .this_id = -1, -}; - -static struct iscsi_transport iscsi_tcp_transport; + struct iscsi_cmd_task *ctask = session->cmds[i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; -static struct iscsi_cls_session * -iscsi_session_create(struct scsi_transport_template *scsit, - uint32_t initial_cmdsn, uint32_t *hostno) -{ - struct Scsi_Host *shost; - struct iscsi_session *session; - int cmd_i; - - shost = iscsi_transport_create_session(scsit, &iscsi_tcp_transport); - if (!shost) - return NULL; - - session = iscsi_hostdata(shost->hostdata); - memset(session, 0, sizeof(struct iscsi_session)); - session->host = shost; - session->state = ISCSI_STATE_FREE; - session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; - session->cmds_max = ISCSI_XMIT_CMDS_MAX; - session->cmdsn = initial_cmdsn; - session->exp_cmdsn = initial_cmdsn + 1; - session->max_cmdsn = initial_cmdsn + 1; - session->max_r2t = 1; - - *hostno = shost->host_no; - - /* initialize SCSI PDU commands pool */ - if (iscsi_pool_init(&session->cmdpool, session->cmds_max, - (void***)&session->cmds, sizeof(struct iscsi_cmd_task))) - goto cmdpool_alloc_fail; - - /* pre-format cmds pool with ITT */ - for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) - session->cmds[cmd_i]->itt = cmd_i; - - spin_lock_init(&session->lock); - INIT_LIST_HEAD(&session->connections); - - /* initialize immediate command pool */ - if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, - (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task))) - goto mgmtpool_alloc_fail; - - - /* pre-format immediate cmds pool with ITT */ - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { - session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; - session->mgmt_cmds[cmd_i]->data = kmalloc( - DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL); - if (!session->mgmt_cmds[cmd_i]->data) { - int j; - - for (j = 0; j < cmd_i; j++) - kfree(session->mgmt_cmds[j]->data); - goto immdata_alloc_fail; - } - } - - if (iscsi_r2tpool_alloc(session)) - goto r2tpool_alloc_fail; - - return hostdata_session(shost->hostdata); - -r2tpool_alloc_fail: - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) - kfree(session->mgmt_cmds[cmd_i]->data); -immdata_alloc_fail: - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); -mgmtpool_alloc_fail: - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); -cmdpool_alloc_fail: - iscsi_transport_destroy_session(shost); - return NULL; -} - -static void -iscsi_session_destroy(struct iscsi_cls_session *cls_session) -{ - struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); - struct iscsi_session *session = iscsi_hostdata(shost->hostdata); - int cmd_i; - struct iscsi_data_task *dtask, *n; - - for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { - struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; - list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) { - list_del(&dtask->item); - mempool_free(dtask, ctask->datapool); - } + mempool_destroy(tcp_ctask->datapool); + kfifo_free(tcp_ctask->r2tqueue); + iscsi_pool_free(&tcp_ctask->r2tpool, + (void**)tcp_ctask->r2ts); } - - for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) - kfree(session->mgmt_cmds[cmd_i]->data); - - iscsi_r2tpool_free(session); - iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); - iscsi_pool_free(&session->cmdpool, (void**)session->cmds); - - iscsi_transport_destroy_session(shost); } static int @@ -3498,13 +2173,14 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, { struct iscsi_conn *conn = cls_conn->dd_data; struct iscsi_session *session = conn->session; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; switch(param) { case ISCSI_PARAM_MAX_RECV_DLENGTH: { - char *saveptr = conn->data; + char *saveptr = tcp_conn->data; gfp_t flags = GFP_KERNEL; - if (conn->data_size >= value) { + if (tcp_conn->data_size >= value) { conn->max_recv_dlength = value; break; } @@ -3515,21 +2191,21 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, spin_unlock_bh(&session->lock); if (value <= PAGE_SIZE) - conn->data = kmalloc(value, flags); + tcp_conn->data = kmalloc(value, flags); else - conn->data = (void*)__get_free_pages(flags, + tcp_conn->data = (void*)__get_free_pages(flags, get_order(value)); - if (conn->data == NULL) { - conn->data = saveptr; + if (tcp_conn->data == NULL) { + tcp_conn->data = saveptr; return -ENOMEM; } - if (conn->data_size <= PAGE_SIZE) + if (tcp_conn->data_size <= PAGE_SIZE) kfree(saveptr); else free_pages((unsigned long)saveptr, - get_order(conn->data_size)); + get_order(tcp_conn->data_size)); conn->max_recv_dlength = value; - conn->data_size = value; + tcp_conn->data_size = value; } break; case ISCSI_PARAM_MAX_XMIT_DLENGTH: @@ -3537,49 +2213,51 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, break; case ISCSI_PARAM_HDRDGST_EN: conn->hdrdgst_en = value; - conn->hdr_size = sizeof(struct iscsi_hdr); + tcp_conn->hdr_size = sizeof(struct iscsi_hdr); if (conn->hdrdgst_en) { - conn->hdr_size += sizeof(__u32); - if (!conn->tx_tfm) - conn->tx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->tx_tfm) + tcp_conn->hdr_size += sizeof(__u32); + if (!tcp_conn->tx_tfm) + tcp_conn->tx_tfm = crypto_alloc_tfm("crc32c", + 0); + if (!tcp_conn->tx_tfm) return -ENOMEM; - if (!conn->rx_tfm) - conn->rx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->rx_tfm) { - crypto_free_tfm(conn->tx_tfm); + if (!tcp_conn->rx_tfm) + tcp_conn->rx_tfm = crypto_alloc_tfm("crc32c", + 0); + if (!tcp_conn->rx_tfm) { + crypto_free_tfm(tcp_conn->tx_tfm); return -ENOMEM; } } else { - if (conn->tx_tfm) - crypto_free_tfm(conn->tx_tfm); - if (conn->rx_tfm) - crypto_free_tfm(conn->rx_tfm); + if (tcp_conn->tx_tfm) + crypto_free_tfm(tcp_conn->tx_tfm); + if (tcp_conn->rx_tfm) + crypto_free_tfm(tcp_conn->rx_tfm); } break; case ISCSI_PARAM_DATADGST_EN: conn->datadgst_en = value; if (conn->datadgst_en) { - if (!conn->data_tx_tfm) - conn->data_tx_tfm = + if (!tcp_conn->data_tx_tfm) + tcp_conn->data_tx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->data_tx_tfm) + if (!tcp_conn->data_tx_tfm) return -ENOMEM; - if (!conn->data_rx_tfm) - conn->data_rx_tfm = + if (!tcp_conn->data_rx_tfm) + tcp_conn->data_rx_tfm = crypto_alloc_tfm("crc32c", 0); - if (!conn->data_rx_tfm) { - crypto_free_tfm(conn->data_tx_tfm); + if (!tcp_conn->data_rx_tfm) { + crypto_free_tfm(tcp_conn->data_tx_tfm); return -ENOMEM; } } else { - if (conn->data_tx_tfm) - crypto_free_tfm(conn->data_tx_tfm); - if (conn->data_rx_tfm) - crypto_free_tfm(conn->data_rx_tfm); + if (tcp_conn->data_tx_tfm) + crypto_free_tfm(tcp_conn->data_tx_tfm); + if (tcp_conn->data_rx_tfm) + crypto_free_tfm(tcp_conn->data_rx_tfm); } - conn->sendpage = conn->datadgst_en ? - sock_no_sendpage : conn->sock->ops->sendpage; + tcp_conn->sendpage = conn->datadgst_en ? + sock_no_sendpage : tcp_conn->sock->ops->sendpage; break; case ISCSI_PARAM_INITIAL_R2T_EN: session->initial_r2t_en = value; @@ -3677,6 +2355,7 @@ iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, uint32_t *value) { struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct inet_sock *inet; switch(param) { @@ -3694,12 +2373,12 @@ iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, break; case ISCSI_PARAM_CONN_PORT: mutex_lock(&conn->xmitmutex); - if (!conn->sock) { + if (!tcp_conn->sock) { mutex_unlock(&conn->xmitmutex); return -EINVAL; } - inet = inet_sk(conn->sock->sk); + inet = inet_sk(tcp_conn->sock->sk); *value = be16_to_cpu(inet->dport); mutex_unlock(&conn->xmitmutex); default: @@ -3714,6 +2393,7 @@ iscsi_conn_get_str_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param, char *buf) { struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; struct sock *sk; struct inet_sock *inet; struct ipv6_pinfo *np; @@ -3722,12 +2402,12 @@ iscsi_conn_get_str_param(struct iscsi_cls_conn *cls_conn, switch (param) { case ISCSI_PARAM_CONN_ADDRESS: mutex_lock(&conn->xmitmutex); - if (!conn->sock) { + if (!tcp_conn->sock) { mutex_unlock(&conn->xmitmutex); return -EINVAL; } - sk = conn->sock->sk; + sk = tcp_conn->sock->sk; if (sk->sk_family == PF_INET) { inet = inet_sk(sk); len = sprintf(buf, "%u.%u.%u.%u\n", @@ -3751,6 +2431,7 @@ static void iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) { struct iscsi_conn *conn = cls_conn->dd_data; + struct iscsi_tcp_conn *tcp_conn = conn->dd_data; stats->txdata_octets = conn->txdata_octets; stats->rxdata_octets = conn->rxdata_octets; @@ -3763,27 +2444,92 @@ iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; stats->custom_length = 3; strcpy(stats->custom[0].desc, "tx_sendpage_failures"); - stats->custom[0].value = conn->sendpage_failures_cnt; + stats->custom[0].value = tcp_conn->sendpage_failures_cnt; strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); - stats->custom[1].value = conn->discontiguous_hdr_cnt; + stats->custom[1].value = tcp_conn->discontiguous_hdr_cnt; strcpy(stats->custom[2].desc, "eh_abort_cnt"); stats->custom[2].value = conn->eh_abort_cnt; } -static int -iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, - char *data, uint32_t data_size) +static struct iscsi_cls_session * +iscsi_tcp_session_create(struct iscsi_transport *iscsit, + struct scsi_transport_template *scsit, + uint32_t initial_cmdsn, uint32_t *hostno) { - struct iscsi_conn *conn = cls_conn->dd_data; - int rc; + struct iscsi_cls_session *cls_session; + struct iscsi_session *session; + uint32_t hn; + int cmd_i; - mutex_lock(&conn->xmitmutex); - rc = iscsi_conn_send_generic(conn, hdr, data, data_size); - mutex_unlock(&conn->xmitmutex); + cls_session = iscsi_session_setup(iscsit, scsit, + sizeof(struct iscsi_tcp_cmd_task), + sizeof(struct iscsi_tcp_mgmt_task), + initial_cmdsn, &hn); + if (!cls_session) + return NULL; + *hostno = hn; - return rc; + session = class_to_transport_session(cls_session); + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + ctask->hdr = &tcp_ctask->hdr; + } + + for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { + struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; + struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data; + + mtask->hdr = &tcp_mtask->hdr; + } + + if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session))) + goto r2tpool_alloc_fail; + + return cls_session; + +r2tpool_alloc_fail: + iscsi_session_teardown(cls_session); + return NULL; } +static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session) +{ + struct iscsi_session *session = class_to_transport_session(cls_session); + struct iscsi_data_task *dtask, *n; + int cmd_i; + + for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { + struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; + struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data; + + list_for_each_entry_safe(dtask, n, &tcp_ctask->dataqueue, + item) { + list_del(&dtask->item); + mempool_free(dtask, tcp_ctask->datapool); + } + } + + iscsi_r2tpool_free(class_to_transport_session(cls_session)); + iscsi_session_teardown(cls_session); +} + +static struct scsi_host_template iscsi_sht = { + .name = "iSCSI Initiator over TCP/IP, v." + ISCSI_VERSION_STR, + .queuecommand = iscsi_queuecommand, + .change_queue_depth = iscsi_change_queue_depth, + .can_queue = ISCSI_XMIT_CMDS_MAX - 1, + .sg_tablesize = ISCSI_SG_TABLESIZE, + .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, + .eh_abort_handler = iscsi_eh_abort, + .eh_host_reset_handler = iscsi_eh_host_reset, + .use_clustering = DISABLE_CLUSTERING, + .proc_name = "iscsi_tcp", + .this_id = -1, +}; + static struct iscsi_transport iscsi_tcp_transport = { .owner = THIS_MODULE, .name = "tcp", @@ -3804,23 +2550,34 @@ static struct iscsi_transport iscsi_tcp_transport = { ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS, .host_template = &iscsi_sht, - .hostdata_size = sizeof(struct iscsi_session), .conndata_size = sizeof(struct iscsi_conn), .max_conn = 1, .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN, - .create_session = iscsi_session_create, - .destroy_session = iscsi_session_destroy, - .create_conn = iscsi_conn_create, - .bind_conn = iscsi_conn_bind, - .destroy_conn = iscsi_conn_destroy, + /* session management */ + .create_session = iscsi_tcp_session_create, + .destroy_session = iscsi_tcp_session_destroy, + /* connection management */ + .create_conn = iscsi_tcp_conn_create, + .bind_conn = iscsi_tcp_conn_bind, + .destroy_conn = iscsi_tcp_conn_destroy, .set_param = iscsi_conn_set_param, .get_conn_param = iscsi_conn_get_param, .get_conn_str_param = iscsi_conn_get_str_param, .get_session_param = iscsi_session_get_param, .start_conn = iscsi_conn_start, .stop_conn = iscsi_conn_stop, + /* these are called as part of conn recovery */ + .suspend_conn_recv = iscsi_tcp_suspend_conn_rx, + .terminate_conn = iscsi_tcp_terminate_conn, + /* IO */ .send_pdu = iscsi_conn_send_pdu, .get_stats = iscsi_conn_get_stats, + .init_cmd_task = iscsi_tcp_cmd_init, + .init_mgmt_task = iscsi_tcp_mgmt_init, + .xmit_cmd_task = iscsi_tcp_ctask_xmit, + .xmit_mgmt_task = iscsi_tcp_mtask_xmit, + .cleanup_cmd_task = iscsi_tcp_cleanup_ctask, + /* recovery */ .session_recovery_timedout = iscsi_session_recovery_timedout, }; diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index 12ef64179b4..c5918854d59 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -2,7 +2,8 @@ * iSCSI Initiator TCP Transport * Copyright (C) 2004 Dmitry Yusupov * Copyright (C) 2004 Alex Aizman - * Copyright (C) 2005 Mike Christie + * Copyright (C) 2005 - 2006 Mike Christie + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * maintained by open-iscsi@googlegroups.com * * This program is free software; you can redistribute it and/or modify @@ -21,20 +22,7 @@ #ifndef ISCSI_TCP_H #define ISCSI_TCP_H -/* Session's states */ -#define ISCSI_STATE_FREE 1 -#define ISCSI_STATE_LOGGED_IN 2 -#define ISCSI_STATE_FAILED 3 -#define ISCSI_STATE_TERMINATE 4 - -/* Connection's states */ -#define ISCSI_CONN_INITIAL_STAGE 0 -#define ISCSI_CONN_STARTED 1 -#define ISCSI_CONN_STOPPED 2 -#define ISCSI_CONN_CLEANUP_WAIT 3 - -/* Connection suspend "bit" */ -#define SUSPEND_BIT 1 +#include <scsi/libiscsi.h> /* Socket's Receive state machine */ #define IN_PROGRESS_WAIT_HEADER 0x0 @@ -42,12 +30,6 @@ #define IN_PROGRESS_DATA_RECV 0x2 #define IN_PROGRESS_DDIGEST_RECV 0x3 -/* Task Mgmt states */ -#define TMABORT_INITIAL 0x0 -#define TMABORT_SUCCESS 0x1 -#define TMABORT_FAILED 0x2 -#define TMABORT_TIMEDOUT 0x3 - /* xmit state machine */ #define XMSTATE_IDLE 0x0 #define XMSTATE_R_HDR 0x1 @@ -62,34 +44,14 @@ #define XMSTATE_W_PAD 0x200 #define XMSTATE_DATA_DIGEST 0x400 -#define ISCSI_CONN_MAX 1 #define ISCSI_CONN_RCVBUF_MIN 262144 #define ISCSI_CONN_SNDBUF_MIN 262144 #define ISCSI_PAD_LEN 4 #define ISCSI_R2T_MAX 16 -#define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */ -#define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */ -#define ISCSI_MGMT_ITT_OFFSET 0xa00 #define ISCSI_SG_TABLESIZE SG_ALL -#define ISCSI_DEF_CMD_PER_LUN 32 -#define ISCSI_MAX_CMD_PER_LUN 128 #define ISCSI_TCP_MAX_CMD_LEN 16 -#define ITT_MASK (0xfff) -#define CID_SHIFT 12 -#define CID_MASK (0xffff<<CID_SHIFT) -#define AGE_SHIFT 28 -#define AGE_MASK (0xf<<AGE_SHIFT) - -struct iscsi_queue { - struct kfifo *queue; /* FIFO Queue */ - void **pool; /* Pool of elements */ - int max; /* Max number of elements */ -}; - -struct iscsi_session; -struct iscsi_cmd_task; -struct iscsi_mgmt_task; +struct socket; /* Socket connection recieve helper */ struct iscsi_tcp_recv { @@ -104,48 +66,32 @@ struct iscsi_tcp_recv { struct iscsi_cmd_task *ctask; /* current cmd in progress */ /* copied and flipped values */ - int opcode; - int flags; - int cmd_status; - int ahslen; int datalen; - uint32_t itt; int datadgst; + char zero_copy_hdr; }; -struct iscsi_cls_conn; - -struct iscsi_conn { - struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ +struct iscsi_tcp_conn { + struct iscsi_conn *iscsi_conn; + struct socket *sock; struct iscsi_hdr hdr; /* header placeholder */ char hdrext[4*sizeof(__u16) + sizeof(__u32)]; int data_copied; char *data; /* data placeholder */ - struct socket *sock; /* TCP socket */ int data_size; /* actual recv_dlength */ int stop_stage; /* conn_stop() flag: * * stop to recover, * * stop to terminate */ /* iSCSI connection-wide sequencing */ - uint32_t exp_statsn; int hdr_size; /* PDU header size */ - unsigned long suspend_rx; /* suspend Rx */ struct crypto_tfm *rx_tfm; /* CRC32C (Rx) */ struct crypto_tfm *data_rx_tfm; /* CRC32C (Rx) for data */ /* control data */ - int senselen; /* scsi sense length */ - int id; /* CID */ struct iscsi_tcp_recv in; /* TCP receive context */ - struct iscsi_session *session; /* parent session */ - struct list_head item; /* maintains list of conns */ int in_progress; /* connection state machine */ - int c_stage; /* connection state */ - struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */ - struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */ - struct iscsi_cmd_task *ctask; /* xmit ctask in progress */ /* old values for socket callbacks */ void (*old_data_ready)(struct sock *, int); @@ -155,95 +101,14 @@ struct iscsi_conn { /* xmit */ struct crypto_tfm *tx_tfm; /* CRC32C (Tx) */ struct crypto_tfm *data_tx_tfm; /* CRC32C (Tx) for data */ - struct kfifo *writequeue; /* write cmds for Data-Outs */ - struct kfifo *immqueue; /* immediate xmit queue */ - struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */ - struct kfifo *xmitqueue; /* data-path cmd queue */ - struct list_head run_list; /* list of cmds in progress */ - struct work_struct xmitwork; /* per-conn. xmit workqueue */ - struct mutex xmitmutex; /* serializes connection xmit, - * access to kfifos: * - * xmitqueue, writequeue, * - * immqueue, mgmtqueue */ - unsigned long suspend_tx; /* suspend Tx */ - - /* abort */ - wait_queue_head_t ehwait; /* used in eh_abort() */ - struct iscsi_tm tmhdr; - struct timer_list tmabort_timer; /* abort timer */ - int tmabort_state; /* see TMABORT_INITIAL, etc.*/ - - /* negotiated params */ - int max_recv_dlength; - int max_xmit_dlength; - int hdrdgst_en; - int datadgst_en; - /* MIB-statistics */ - uint64_t txdata_octets; - uint64_t rxdata_octets; - uint32_t scsicmd_pdus_cnt; - uint32_t dataout_pdus_cnt; - uint32_t scsirsp_pdus_cnt; - uint32_t datain_pdus_cnt; - uint32_t r2t_pdus_cnt; - uint32_t tmfcmd_pdus_cnt; - int32_t tmfrsp_pdus_cnt; - - /* custom statistics */ + /* MIB custom statistics */ uint32_t sendpage_failures_cnt; uint32_t discontiguous_hdr_cnt; - uint32_t eh_abort_cnt; ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); }; -struct iscsi_session { - /* iSCSI session-wide sequencing */ - uint32_t cmdsn; - uint32_t exp_cmdsn; - uint32_t max_cmdsn; - - /* configuration */ - int initial_r2t_en; - int max_r2t; - int imm_data_en; - int first_burst; - int max_burst; - int time2wait; - int time2retain; - int pdu_inorder_en; - int dataseq_inorder_en; - int erl; - int ifmarker_en; - int ofmarker_en; - - /* control data */ - struct Scsi_Host *host; - int id; - struct iscsi_conn *leadconn; /* leading connection */ - spinlock_t lock; /* protects session state, * - * sequence numbers, * - * session resources: * - * - cmdpool, * - * - mgmtpool, * - * - r2tpool */ - int state; /* session state */ - int recovery_failed; - struct list_head item; - void *auth_client; - int conn_cnt; - int age; /* counts session re-opens */ - - struct list_head connections; /* list of connections */ - int cmds_max; /* size of cmds array */ - struct iscsi_cmd_task **cmds; /* Original Cmds arr */ - struct iscsi_queue cmdpool; /* PDU's pool */ - int mgmtpool_max; /* size of mgmt array */ - struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */ - struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */ -}; - struct iscsi_buf { struct scatterlist sg; unsigned int sent; @@ -259,16 +124,13 @@ struct iscsi_data_task { }; #define ISCSI_DTASK_DEFAULT_MAX ISCSI_SG_TABLESIZE * PAGE_SIZE / 512 -struct iscsi_mgmt_task { - struct iscsi_hdr hdr; /* mgmt. PDU */ - char hdrext[sizeof(__u32)]; /* Header-Digest */ - char *data; /* mgmt payload */ +struct iscsi_tcp_mgmt_task { + struct iscsi_hdr hdr; + char hdrext[sizeof(__u32)]; /* Header-Digest */ int xmstate; /* mgmt xmit progress */ - int data_count; /* counts data to be sent */ struct iscsi_buf headbuf; /* header buffer */ struct iscsi_buf sendbuf; /* in progress buffer */ int sent; - uint32_t itt; /* this ITT */ }; struct iscsi_r2t_info { @@ -285,34 +147,22 @@ struct iscsi_r2t_info { struct iscsi_data_task *dtask; /* which data task */ }; -struct iscsi_cmd_task { - struct iscsi_cmd hdr; /* iSCSI PDU header */ +struct iscsi_tcp_cmd_task { + struct iscsi_cmd hdr; char hdrext[4*sizeof(__u16)+ /* AHS */ sizeof(__u32)]; /* HeaderDigest */ char pad[ISCSI_PAD_LEN]; - int itt; /* this ITT */ - int datasn; /* DataSN */ + int pad_count; /* padded bytes */ struct iscsi_buf headbuf; /* header buf (xmit) */ struct iscsi_buf sendbuf; /* in progress buffer*/ + int xmstate; /* xmit xtate machine */ int sent; struct scatterlist *sg; /* per-cmd SG list */ struct scatterlist *bad_sg; /* assert statement */ int sg_count; /* SG's to process */ - uint32_t unsol_datasn; uint32_t exp_r2tsn; - int xmstate; /* xmit xtate machine */ - int imm_count; /* imm-data (bytes) */ - int unsol_count; /* unsolicited (bytes)*/ int r2t_data_count; /* R2T Data-Out bytes */ - int data_count; /* remaining Data-Out */ - int pad_count; /* padded bytes */ - struct scsi_cmnd *sc; /* associated SCSI cmd*/ - int total_length; int data_offset; - struct iscsi_conn *conn; /* used connection */ - struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */ - - struct list_head running; /* running cmd list */ struct iscsi_r2t_info *r2t; /* in progress R2T */ struct iscsi_queue r2tpool; struct kfifo *r2tqueue; |